New research by Nina Jablonski and George Chaplin has led to the discovery that women across the world generally produce 3-4% less melanin in their skin than men.
They suggest that this is probably due to the fact that women have much higher calcium requirements during their reproductive years.
Why is fair skin attractive?
Researchers have found that men are subconsciously attracted to lighter skin because of its associations with purity, innocence, modesty, and goodness, while women feel that darker skin is associated with sex, masculinity, and danger.Learn more about skin here.
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How many years would it take the Atlantic Ocean to grow 500 centimeters? Show your work.
Answer:
250 years
Explanation:
The Atlantic Ocean is not static, but instead it is very active, and it is actually spreading from its central part. In its central part, this ocean has a mid-ocean ridge. This basically means that there is constant formation of new crust from the magma that comes out, and the old crust is pushed sideways as the new one is formed. On an annual level, the mid-ocean ridge is spreading out by an estimated 0.02 meters, thus that is how much the Atlantic Ocean is spreading out each year. In order to get to the result as to how many years are needed for the Atlantic Ocean to spread 500 cm, we just need to multiply the annual spreading with the number of cm in question:
0.02 x 500 =250
Thus we get a result of 250, meaning that in 250 years the Atlantic Ocean will spread out 500 cm in total.
Answer:
200 years.
Explanation:
The Atlantic Ocean widens by 2.5 centimeters every year. So,
[tex]\frac{2.5 cm}{1 year}[/tex] (2.5 cm/1 year) = [tex]\frac{500 cm}{x year}[/tex] (500 cm/ x year)
Cross-multiply to solve for x:
x(2.5) = (1) (500)
x = 500 ÷ 2.5
x = 200 years.
It will take 200 years for the Atlantic Ocean to grow by 500 centimeters.
Historically, greatest threats to human health came from
Answer:
The answer would be pathogenic organisms!
Hope this helps!
Historically, greatest threats to human health came from pathogenic organisms.
How have pathogens been dangerous to humans ?Historically, the greatest threats to human health came from pathogenic organisms, such as bacteria, viruses, parasites, and fungi. These organisms can cause a wide range of diseases, including:
In the past, pathogenic organisms were the leading cause of death in humans. However, thanks to advances in medicine and public health, the death rate from these diseases has declined significantly. However, pathogenic organisms still pose a significant threat to human health, especially in developing countries.
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4. Which immune cells circulate in the body, providing immunity by producing antibodies?
Answer:
Immune System
Explanation:
Antibodies are produced by white blood cells called B cells ( B lymphocytes ) and they develop from stem cells in the bone marrow. B cells are activated when an antigen is present.
Photosynthesis is important to living organisms because
Answer:
Photosynthesis is important to living organisms because:
Provides the plant with the glucose it requires for its subsistence from the absorption of carbon dioxide, water and sunlight, which additionally produces oxygen, an essential element for living beings that acquire it through respiration.Explanation:
Photosynthesis is commonly called the process "by which plants produce their own food," however, this is not the only function of this process, since, in addition to absorbing carbon dioxide from the environment (which living beings we expel through respiration), it releases oxygen into the environment which is essential for our subsistence as it is the element that our body requires and that we acquire through respiration.
An experiment was done to determine if grass will grow taller if it is water weekly than grass that is not watered. What is the dependent variable
Answer: the height of the grass
Explanation: The height of the grass is dependent on the amount of water (the independent variable).
The dependent variable in the experiment is the grass height.
Explanation:In the given experiment, the dependent variable is the grass height. The experiment aims to determine if grass will grow taller when watered weekly compared to grass that is not watered. The dependent variable is the variable that is being measured or observed in the experiment, which is the height of the grass in this case.
An ecosystem is like a machine that cycles matter by using
An ecosystem is like a machine that cycles matter by using:
captured energy.
hope this helps!
Species can vary in several ways. Which of the following is one of Darwin's ideas that was accepted by most scientists of his time due to the large number of fossils being discovered at that time?
A. Species vary around the world.
B. Species have specific adaptations to their local environment.
C. Species that live in seawater can also live on mountains.
D. Species change over long periods of time.
Answer:
B. Species change over long periods of time
Explanation:
Darwin was a revolutionary scientist in the field of biology and evolution. He managed to notice that the animals are changing over time, and that one species can become much different over time because of the changes in its environment. The theory of Darwin was that the species change in accordance to their environment, thus they develop advantageous traits so that they can be more competitive. As there were lot of fossils found in this period of time, so there was a lot to compare with, great deal of scientists accepted Darwin's theory, though they had lot of criticism for some other theories of his.
Answer:
D. Species change over long periods of time.
Which structure helps animal cells maintain their shape?
Hello There!
The answer to this is called a "cytoskeleton"
A cytoskeleton is a series of intercellular proteins that help a cell with its shape, movement, division and the organelle movement.
What does the formula below represent?
CO2 + H20 → C6H1206 +02
A: photosynthesis
B: ionization of glucose
C: hydrolysis of carbohydrates
D: dehydration
Answer:
The correct answer is option A: "photosynthesis".
Explanation:
Photosynthesis is the process by producers, such as plants and some bacteria, at which they produce glucose from carbon dioxide and water using sunlight as fountain of energy. Oxygen is a byproduct of photosynthesis, which is used by aerobic organisms to perform cellular respiration. The formula herein included represents the process of photosynthesis, since the combination of carbon dioxide (CO2) and water (H20), produces glucose (C6H1206) and oxygen (02).
Aragonite shells of clams, snails, or scleractinian corals may be preserved unaltered in Cenozoic deposits, but they are generally dissolved or recrystallized in older deposits.
TRUE or FALSE
Answer:
The above statement is true.
Explanation:
The shells of aragonite are affected by various ongoing earth dynamic processes, such as physical and chemical weathering and erosion of the rock layers that contain these fossils, chemical reactions between fossils and acid water dissolving the materials of the shells.
The older Paleozoic and Mesozoic rocks have undergone significant changes with increasing time due to the effects of events such as tectonism, volcanism, erosion and so on. So the fossils present in these rocks were affected and were altered. But the rocks of the Cenozoic era are of recent age, about 65-60 million years old. During this era, massive deposition of sediments has taken place throughout the globe which provides a suitable condition for the preservation of fossils like aragonite shells. So these fossils found in these deposits are not much altered.
what is a gamete ????
A gamete is a haploid cell is produced by meiosis.
What is a gamete?Sperm refers to the male gametes found in the human reproductive system, while ova or eggs refer to the female gametes found in the reproductive system.
These are the reproductive cells that are produced as a result of the meiosis process.
Thus, we can conclude that option A is correct.
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Choose the best definition of allele.
A. One of several possible versions of a gene, which each produce a different phenotype
B. An organism that's purebred for a given trait
C. The process of fertilizing a plant with pollen from another plant
D. A set of genes that are located on the same chromosome and so are tightly linked
Answer:
A. One of several possible versions of a gene, which each produce a different phenotype
Explanation:
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An order is subdivided into several _____.
An order is subdivided into several families.
In biological classification, the hierarchy of classification goes from broadest to most specific, with the order being a higher taxonomic rank than a family. The taxonomic hierarchy, commonly used in biology and ecology, follows this order: Domain, Kingdom, Phylum, Class, Order, Family, Genus, and Species.
An order is a rank or category that includes one or more related families. It groups together organisms that share some common characteristics but are more closely related to each other than to members of other orders. Within an order, the families share certain similarities, but they also have enough differences to warrant separate classification.
For example, let's consider the order Carnivora, which includes animals like cats, dogs, and bears. Within the order Carnivora, there are several families, such as Felidae (cats), Canidae (dogs), Ursidae (bears), and others. Each family represents a more specific group of related species within the broader order Carnivora.
Taxonomic classification is essential for organizing the vast diversity of life on Earth and understanding the evolutionary relationships between different groups of organisms. It allows scientists to study and categorize species based on shared characteristics and evolutionary history. Subdividing orders into families is just one step in this systematic approach to classifying and understanding the rich tapestry of life on our planet.
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5. Which nutrient is changed by bacteria into different forms?
Through
80%
A water
of Chemicals in
om
B carbon
c nitrogen
act and Technology
Doxygen
y Systems II
Answer:
C. nitrogen
Explanation:
Nitrogen is changed by bacteria into different forms.
1. Key Concept List the
major biomes, and give one
characteristic feature of each.
Biodiversity is crucial to the continued evolution of life on Earth for several key reasons:
1. Genetic Diversity: Biodiversity encompasses the genetic variation within species. This genetic diversity is the raw material for evolution, allowing species to adapt to changing environmental conditions. Without a wide range of genetic traits, species may not be able to survive in the face of environmental stressors such as climate change, diseases, or habitat loss.
2. Species Interactions: The variety of species within an ecosystem contributes to a complex web of interactions, including predation, competition, pollination, and symbiosis. These interactions can drive natural selection and lead to the evolution of new traits and species. The loss of biodiversity can simplify these interactions, potentially slowing down or altering the course of evolution.
3. Ecosystem Resilience and Functioning: Biodiversity contributes to the resilience of ecosystems, enabling them to withstand shocks and stresses. A diverse ecosystem can recover more quickly from disturbances and maintain functioning, which in turn supports the continued evolution of its component species.
4. Adaptation and Speciation: A diverse gene pool and a variety of species increase the chances of adaptation to new or changing environments. This can lead to speciation, where new species evolve to fill ecological niches. The more diverse the pool of organisms, the greater the potential for new species to arise.
5. Ecosystem Services: Biodiversity provides essential ecosystem services, such as pollination, water purification, and nutrient cycling, which are vital for the survival of many species, including humans. The continued evolution of life depends on these services, which are underpinned by a rich tapestry of biodiversity.
6. Biological Innovations: Biodiversity is a source of biological innovations that can inspire human innovations in fields such as medicine, agriculture, and technology. These innovations can, in turn, influence the trajectory of evolution by altering the selective pressures on organisms.
7. Cultural and Aesthetic Value: Biodiversity enriches human life culturally and aesthetically, influencing the way societies value and protect nature. This cultural connection can translate into conservation efforts that preserve evolutionary processes.
In summary, biodiversity is not just a measure of the health of ecosystems but also a driver of evolutionary change. It provides the necessary conditions for natural selection to operate, ensuring that life on Earth continues to evolve and adapt to an ever-changing world. The conservation of biodiversity is therefore essential for the continued evolution of life in all its forms.
Which of the following describes the properties of ferns?
A. They don't have vascular tissue and reproduce with spores.
B. They have vascular tissue such as xylem and phloem and reproduce with spores.
C. They have vascular tissue such as xylem and phloem and reproduce with seeds.
D. They don't have vascular tissue and reproduce with seeds
Answer: C. They have vascular tissue such as xylem and phloem and reproduce with spores.
Explanation: This is the correct answer for Pennfoster.
Answer:
The answer is C.
Explanation:
Mosses are the category of plants that do not have vascular tissue or seeds. Ferns do not have seeds but do have vascular tissues. Angiosperms and gymnosperms have vascular tissue and seeds. Seedless vascular plants, which include club mosses, horsetails, and ferns, have vascular tissues. These tissues allow fluids to travel through the plant. Xylem is a specialized plant tissue that carries water from the roots throughout the rest of the plant, and phloem carries nutrients and sugars. You can see these tissues in the cross-section tissues of a vascular plant shown below. Although ferns have vascular tissue, they still reproduce using spores, and not seeds, following the alternation of generations.
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1) scientists can insert a gene into a bacterium. How does this biotechnology help individuals with diabetes?
A) a person with diabetes can regulate insulin production by eating products that contain the special bacterium and the new gene.
B) The bacterium itself can be used as a treatment for a person with diabetes because it can deliver the genes for human insulin to that person’s cells.
C) the insertation of a gene into a bacterium allows scientists to modify the gene that regulates insulin production. the new gene for human insulin can then be reinserted into someone who has diabetes.
D) When the bacterium reproduces, it passes the gene for human insulin to its offspring. The offspring form a colony of bacteria that contain the gene for human insulin, which can then be used to produce insulin for a person with diabetes.
Answer:
D. When the bacterium reproduces, it passes the gene for human insulin to its offspring. The offspring form a colony of bacteria that contain the gene for human insulin, which can then be used to produce insulin for a person with diabetes.
Explanation:
When the bacterium reproduces, it passes the gene for human insulin to its offspring colony. The offspring colony form a colony of bacteria which contain the gene for human insulin, that can then be used to produce insulin for a person with diabetes. Scientists can insert a gene into a bacterium this biotechnology help individuals with diabetes.Thus, the correct option is D.
What is the function of insulin in the body?The pancreas acknowledge by producing insulin that allows glucose to enter the body's cells to provide energy. After eating when insulin levels are high excess glucose is stored in the liver in the form of glycogen.
Recombinant DNA is a technology scientists developed which made it possible to insert a human gene into the genetic material of a common bacterium.
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A series of connections of food chain in an ecosystem is called a what
Answer:
Food web
Explanation:
A series of connections of food chain in an ecosystem is called a Food web.
Hope this helps!
_ is a product of the first stage of photosynthesis.
ATP
Glucose
Carbon dioxide
Water
Answer:
ATP
Explanation:
ATP is a product of the first stage of photosynthesis.
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30 points
Why are most volcanoes found around the Ring of Fire?
This is a location where there are many hot spots.
This is a location of numerous plate boundaries.
This is a location within an active oceanic plate.
This is a location of fast moving continental crust.
Answer:because of the amount of movement of tectonic plates along the area
Explanation:
The Ring of Fire, also referred to as the Circum-Pacific Belt, is a path along the Pacific Ocean characterized by active volcanoes and frequent earthquakes. Its length is approximately 40,000 kilometers (24,900 miles). It traces boundaries between several tectonic plates—including the Pacific, Juan de Fuca, Cocos, Indian-Australian, Nazca, North American, and Philippine Plates.
Seventy-five percent of Earth’s volcanoes—more than 450 volcanoes—are located along the Ring of Fire. Ninety percent of Earth’s earthquakes occur along its path, including the planet’s most violent and dramatic seismic events.
The abundance of volcanoes and earthquakes along the Ring of Fire is caused by the amount of movement of tectonic plates in the area. Along much of the Ring of Fire, plates overlap at convergent boundaries called subduction zones. That is, the plate that is underneath is pushed down, or subducted, by the plate above. As rock is subducted, it melts and becomes magma. The abundance of magma so near to Earth’s surface gives rise to conditions ripe for volcanic activity. A significant exception is the border between the Pacific and North American Plates. This stretch of the Ring of Fire is a transform boundary, where plates move sideways past one another. This type of boundary generates a large number of earthquakes as tension in Earth’s crust builds up and is released.
Answer:
the answer is C
Explanation:
red flowered snapdragons are crossed with white flowered snapdragons, producing all pink snapdragons in the F1 generation. what would you expect if you crossed pink with pink? 3/4, 1/4, 1/2 red, 3/4,/1/2,/1/4 pink,1/2, 3/4, 1/4 white
Answer:
1/4 Red
1/2 Pink
1/4 White
Explanation:
Well what you have there is an incomplete dominance situation, where both alleles for the trait are expressed in the off spring but come out blended.
The problem says that F1 generation are all pink, so that would mean that all are heterozygous for he trait.
Let R = Red ; and W = white.
RW and RW
R W
R RR RW
W RW WW
Based on this, we know now that the cross would result in:
1/4 Red
1/2 Pink
1/4 White
In which ways are Mercury and Venus similar?
Answer:
They both are small and rocky
Explanation:
Just answered it
Answer:
They both small and rocky
Explanation:
Which of the following is the best definition of a saturated fatty acid?
A. An insoluble compound made up of glycerol and three fatty acids
B. A basic unit of a lipid that consists of single and double carbon-to-
carbon bonds
C. A basic unit of a lipid that consists of only single carbon-to-carbon
bonds
D. A compound that carries hereditary information
An original DNA strand has the following base sequence TAGGTAACT what base sequence would be produced through DNA replication
Answer:
ATCCATTGA
Explanation:
Answer:
ATCCATTGA
Explanation:
As we know that DNA consists of complementary bases.
As per the pairing rule of DNA -
Adenine pair up with Thymine
Guanine pair up with Cytosine
Hence, A = T
and C= G
Now if replica is formed of any base sequence, then it must have complementary bases.
Thus, the replica of TAGGTAACT would be ATCCATTGA
an organism has the following traits multicellular cant photosynthesize has a skull. wht kingdom does this organism most likely belong too?
Answer:
Animalia
Explanation:
Make sure it says multicellularIf it says unicellular its archaea
apex
According to the given characters, this type of organisms ,most likely to belong Animalia.
What defines kingdom Animalia?Kingdom Animalia constitutes all animals. Amongst the five kingdoms, the largest kingdom is the animal kingdom. Animals are multicellular eukaryotes. However, like plants, they do not possess chlorophyll or a cell wall.
Characteristics of members of kingdom Animalia are:
They are multicellular organisms which do not possess chlorophyll.
Photosynthesis is absent as they are heterotrophs. Skull is protective encase which protect the brain is present.
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How are human beings and chimpanzees phylogenetically related?
Answer:
I would say that its they are descendant of a common ancestor. DNA shows that our species and chimpanzees diverged from a common ancestor species that lived between 8 and 6 million years ago.
Explanation:
what is the volume of a book that has a width of 10 cm a length that is 2 times the width and a height that is half they would remember to express your answer in keeping units
Answer:
[tex]1000[/tex] cubic centimeters
Explanation:
Given -
Width of the book is equal to [tex]10[/tex] cm
Length of the book is two times the width of the book
Which means length is equal to
[tex]2 * 10\\= 20[/tex] cm
Height of the book is half of the width of the book
Which means height is equal to
[tex]0.5 * 10\\= 5[/tex] cm
Volume of the book is equal to the product of length, width and height
[tex]= 10 * 20* 5\\= 1000[/tex] cubic centimeters
The volume of the book is 1000 cm³.
Explanation:To find the volume of the book, we need to multiply the width, length, and height. The width is given as 10 cm. The length is 2 times the width, which is 20 cm. The height is half of the width, which is 5 cm.
Therefore, the volume of the book is 10 cm * 20 cm * 5 cm = 1000 cm³.
The diagram shows a phase of mitosis.
Which does the letter A represent in the diagram?
centriole
chromosome
centromere
spindle
Answer:
D
Explanation:
Just took the test ;)
The letter A represents spindle in the diagram. Therefore, option (D) is correct.
The mitotic spindle or achromatic mitotic apparatus of a cell is a bipolar assemblage of microtubules that is inflated in the center.
The achromatic spindle, meiotic spindle, or mitotic spindle is a set of microtubules that flow from centrioles during cell division, from chromosome centromeres to pole centrioles. The centrosome (animal cell) or microtubule organising center (plant cell) produces them.
During metaphase, all chromosomes are placed on the equatorial plane of the dividing cell, and during anaphase, each of the two chromatids in which a chromosome is divided is propelled to one of the two poles of the cell by microtubules. The mitotic or achromatic spindle microtubules are anchored in chromosome centromeres by proteinaceous leaves called kinetochores.
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What would happen if a membrane protein were unable to blind to a signal molecule
Answer:
Messages would not be sent to the inside of the cell
Explanation:
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Which is not a problem associated with the increased use of nuclear energy?
major hazards involved in nuclear waste disposal
the possibility of a serious nuclear accident
the cost of building safe nuclear facilities
too many nuclear explosions in reactors
I think the answer is too many nuclear explosions in reactors . (D) Nuclear energy is made this way, how can it be a problem?
A, B, and C are for sure problems with an increase in use of nuclear energy.
I hope this helps! :)
Answer: The cost of building safe nuclear facilities .
Explanation:
The nuclear energy is the harnessed in a nuclear power plant. In which the continuous nuclear fusion and fission reactions over a heavy metal takes place in controlled conditions of a nuclear reactor. The radiations and thermal energy produced in the reaction can be harmful for the surrounding environment. The leakage of radiations can be harmful as they can cause explosion in air and deadly mutation in living beings. The waste generated after the process is radioactive in nature which can also cause mutations. Although the nuclear energy is an alternate source of energy but it can be hazardous for the surrounding environment.
Among the options given, The cost of building safe nuclear facilities . is not a problem associated with the use of nuclear energy. As the generation of nuclear energy as the financial crises can be overcome but the loss of lives and environmental disasters caused by the nuclear radiations cannot be overcome.