In the past 10,000 years, when did the human population experience negative growth?

A) during the Christian era
B) during the Industrial Revolution
C) during the Bubonic plague
D) near the Grinnell glacier

Answer:

D

Explanation:

We use fossil fuels more than any other form.

Answer:

D. Fossil fuel

Explanation:

Answer:

production of gametes is not a function of mitosis

Explanation:

Replacement and regeneration of new cells- Regeneration and replacement of worn-out and damaged tissues is a very important function of mitosis in living organisms. Mitosis helps in the production of identical copies of cells and thus helps in repairing the damaged tissue or replacing the worn-out cells.

The question is not complete and is not available anywhere so it can be answered in a general way.

Answer:

At the ultrastructure level the nerve cell, has all the organelles in it. The organelles inside the cell helps in maintaining the cell alive and remains functional.

These include organelles such as nucleus, nucleolus and Golgi apparatus and  mitochondria.

The microscopic level inside a muscle fiber is same like that of other cells besides the number of mitochondria is more.

Answer:

1. contraction

2. actin

3. tendons

4. epidermis

5. dermis

6. acne

7. A nerve signal from the brain arrives at the intersection of the nerve and muscle cells and releases acetylcholine from the neuron. This triggers chemical changes in the muscle cell involving ions, including Ca2+. Calcium triggers the thick filaments, made of myosin, to attach to the thin filaments, made of actin, in the muscle cell, and the myosin pulls the actin toward the center of the muscle cell. ATP causes the release of the actin fibers, allowing the muscle to relax and the process to begin again.

Explanation: answers to all questions on this section.

Penn Foster

Answer:

The main difference between chromatin and chromosome is that chromatin consists of the unravelled condensed structure of DNA for the purpose of packaging into the nucleus whereas chromosome consists of the highest condensed structure of the DNA doublehelix for the proper separation of the genetic material between daughter cells.

Chromatin is the combination of DNA and proteins that make up chromosomes. Chromosomes are condensed during cell division but exist as less condensed chromatin when the cell is not dividing.

To understand chromatin, it is helpful to first consider chromosomes. Chromosomes are structures within the nucleus that are made up of DNA, the hereditary material, and proteins. This combination of DNA and proteins is called chromatin. In eukaryotes, chromosomes are linear structures. For example, in humans, the chromosome number is 46, whereas in fruit flies, the chromosome number is eight.

When a cell is not dividing, the chromosomes are in a less condensed, thread-like form known as chromatin. During cell division, chromatin condenses to form distinct chromosomes that are visible under a microscope. Therefore, chromatin describes the material that makes up chromosomes both when they are condensed and decondensed.

Answer:

C

Explanation:

The girls should be sure all other conditions remain constant throughout all three groups to get a valid result. The correct option is C.

The accuracy with which a method measures what it is intended to measure is referred to as its validity.

If research has high validity, it produces results that correspond to real physical or social properties, characteristics, and variations. One sign that a measurement is valid is high reliability.

The consistency of a measure is defined as whether the results can be reproduced under the same conditions.

The validity of a research study refers to how well the findings among study participants correspond to true findings among similar individuals outside of the study.

This definition of validity applies to all clinical studies, including those on prevalence, associations, interventions, and diagnosis.

To make it a valid result the girls should keep a constant condition throughout the experiment to get out a positive result.

Thus, the correct option is C.

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Specifically, in the case of cholera, the breakdown of water/sanitation systems and significant decrease in hygeine standards can cause diarrheal diseases.

Crowding in shelters/camps, increasing contact between people

Mixing of different regional populations with different levels of vaccination or endemic disease

Contamination of drinking water

Spread of infectious mud or soils (leptospirosis)

Disruption or delay of vaccination programs

Death or disappearance of key medical and administrative staff

Destruction of key facilities (laboratories, hospitals, clinics, etc.)

The similarity of 94% in their DNA sequence suggest that they have originated from a common ancestor and are closely related species.

Explanation:

The difference in DNA sequences in different species is due to the accumulation of genetic variation in the course of natural selection and evolution. Less is the difference in DNA sequences of two organisms the more related they are.

Genes determine the characteristics in an organism, and they are DNA sequences determining the protein to be formed. The similarity in DNA sequence of two species establish the evolutionary relationship among them.

Due to the genetic variation in species, the natural selection of the species had caused the evolution of the species adapted well to the environment.

Answer:

When cycling of matter in the ecosystems is disrupted, the whole ecosystem will be adversely affected. Matter includes living organisms such as plants, animals and microorganisms while non living things such water, air and nutrients etc. If plants are removed from the ecosystem system, then the whole ecosystem is destroyed because plants are the producer which make food for herbivores. These herbivores are eaten by carnivores and so on.

Answer: B. The smallest part of an atom

Explanation:

Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.

Answer:

0%

Explanation:

50% will be pink and the other 50% will be white

Answer:

I believe it's A

Explanation:

hope this helps

Answer:

They improve the quality

Answer: mixing and loosening soil by burrowing

Explanation:

Answer:

PLATO AND EDMENTUM PEOPLE your answer is:

134/200

Explanation:

The expression represents the correct way to calculate the frequency of the dominant allele is 134/200.

A Dominant allele may be defined as a type of allele that significantly produces the identical phenotype whether its paired allele is identical or different.

The frequency of the dominant allele can be calculated by the following formula:

[tex]\frac{2 * Number of dominant individual + Number of heterzygote individuals}{2 * Total number of individuals}[/tex]

=  [tex]\frac{2* 50 + 34}{2*100}[/tex]

= 100 +34/200 = 134/200.

Therefore, the expression represents the correct way to calculate the frequency of the dominant allele is 134/200.

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Your question seems incomplete. The most probable complete question is as follows:

In a particular species of frogs, black spots are a dominant trait in their absence is a recessive trait. In a population of frogs, 50 are homozygous for the dominant trait, 34 are heterozygous, And 16 show the recessive trait. Which expression is the correct way to calculate the frequency of the dominant allele?

Answer:

These are solar panels, they capture energy from the sun

Explanation:

The energy needed for biological functions comes from ATP molecules produced during cellular respiration (Option 3), involving the digestive, cardiovascular, and respiratory systems.

The energy necessary to perform functions in living organisms mainly comes from ATP (adenosine triphosphate) molecules produced during cellular respiration (Option 3). Cellular respiration is an intracellular process that converts glucose and oxygen into carbon dioxide, water, and most importantly, ATP. This process requires the involvement of the digestive, cardiovascular, and respiratory systems. Digestion breaks down food to obtain glucose, while the respiratory system facilitates the exchange of gases, providing oxygen to the body and expelling carbon dioxide. ATP then is used as the main energy source for various biological processes.

A is cell, B is organ, and c is tissue.

If this is wrong please tell me and I'll see if I can figure out what I did wrong.

Answer:

A-Cell

B-organ

C-tissue

these are the correct answers.

Explanation:

Answer: A. It is the coldest biome

Explanation:

Answer:

A

Explanation:

Answer:

6. Because of how old the rocks are

Explanation:

6. Sedimentary rock forms in layers because of the order they were formed. The older rocks will form first and as time goes on, rock forms above it to create a new layer, and  so on.

Answer:

The correct option is A.

Convergent evolution is one of the defined type of evolution and it  is shown by the  species belonging to different ancestors show similar characteristics due to the same residing environmental condition.

Explanation:

The creation of analogous structure takes place in the process of convergent evolution. This is illustrated by the occurrence of similar structure in two different species which were not observed in their respective ancestor. This is due to the residence of the associated species in the same environmental condition and facing the same problems of livelihood. One of the most common example is the flying  ability of the insects, bats and birds.

Answer:

Explanation:

The phases are the result from the angle of moon and sun as viewed from the earth.

Answer:

How the moon orbits the earth affects the way we see the moon

Explanation:

Answer:

Write notes on the accesary organs of digestion found in the mouth and their function and structure?

Digestion begins in the mouth as mastication starts while chewing the food material, when food materials are masticated digestion begins as enzyme starts acting on food materials right from the mouth which aids digestion

Explanation:

Answer:

begins even before the introduction of photography

Explanation:

cameras evolved from the camera obscura though many generations of photographic technology

Final answer:

The history of the camera dates back to the camera obscura utilized since the 16th century. Significant advancements occurred with Nicéphore Niépce's light-sensitive surface in the 19th century, followed by Daguerreotype and the introduction of photographic film. These innovations led to widespread accessibility of photography and the dawn of the motion-picture era.

Explanation:

History of Camera:

The history of the camera can be traced back to the camera obscura, a device used since the 16th century to project images of external scenes. The camera, derived from the Latin 'camera obscura' meaning 'dark chamber', evolved significantly with French inventor Joseph Nicéphore Niépce's creation of a light-sensitive surface in the 19th century. This discovery marked the beginning of modern photography.

Photography developed rapidly in the mid-19th century when Nicéphore Niépce successfully photographed images with a camera, but his early attempts required days of exposure. His colleague Louis Daguerre improved this process with the invention of the Daguerreotype, which significantly reduced exposure time and enhanced image clarity. The introduction of the Daguerreotype in 1839 is often regarded as the birth of practical photography.

Photographic technology advanced further when George Eastman invented photographic film in 1884. The Kodak #1 camera in 1888 and the Kodak Brownie camera by 1900 broadened photography's accessibility to a wider audience. With these developments, including motion-picture cameras and the birth of cinema, photography's impact on society and the arts has been profound and continues to evolve today.

Answer: Both DNA and RNA have four nitrogenous bases each—three of which they share (Cytosine, Adenine, and Guanine) and one that differs between the two (RNA has Uracil while DNA has Thymine). ... One of the most significant similarities between DNA and RNA is that they both have a phosphate backbone to which the bases attach.

Explanation:

Hope i could help please give brainliest i would apreciate it!

Answer: They both have suga-phosphate backbone. They are made up of monomers called nucleotides.

Explanation: Nucleotides are monomeric units of nucleic acids. Nucleotides are made up of three parts: the pentose (5-carbon) sugar, a phosphate group and a nitrogenous bases. Both DNA and RNA have four nitrogenous bases but the only difference is that DNA contains Thymine while RNA contains Uracil. They both have adenine, cytosine and guanine in common. The sugar-phosphate backbone forms the rail of both DNA and RNA, each having a pentose-phosphate group but the difference is that DNA contains deoxyribose while RNA contains ribose sugar.

Answer:

When higher levels of carbon dioxide is present in the environment and a mustard plant seedling is transferred to an environment, the new leaves have a lower stomata-to-surface-area ratio, it is because the concentration of carbondioxide is high in the surrounding so the plant produce small leaves having less number of stomata. If the concentration of carbondioxide is lower so big leaves are produced having maximum number of stomata.

Answer: 13%

Explanation: It says on the wheel, 13% on exports

Answer:

Geotropism is the influence of gravity on plant growth or movement. Simply put, this means that roots grow down and stems grow up. ... In this case, the stimulus is gravity. Upward growth of plant parts, against gravity, is called negative geotropism, and downward growth of roots is called positive geotropism.

Explanation:

The answer is D. Chromosomes contain genes, and genes are made of DNA

DNA consists of genes that contain instructions to build proteins and are organized into large structures called chromosomes.

DNA (deoxyribonucleic acid) is a helix-shaped molecule comprised of nucleotide base pairs that contain the genetic blueprint of an organism. It is found within structures known as chromosomes, which are made of tightly coiled DNA and proteins called histones. Genes are specific segments of DNA that carry the instructions for making proteins, which perform a vast array of functions within an organism. Each chromosome contains many genes, and these are organized in a specific sequence that is largely the same across individuals of the same species. For example, all humans have chromosomes with the same genes in the same order, although they may have different variations of those genes known as alleles.

Humans typically possess 23 pairs of chromosomes, with one set inherited from each parent. The egg and sperm cells each contribute 23 chromosomes. Chromosomes are involved in heredity, with genes being the basic units of inheritance that dictate specific traits such as eye and hair color.

Answer:

C) Flush out the contaminants with an excessive amount of water.

Explanation:

Water is universal solvent. It dissolve many solutes inside it. Soil is contaminated with number of chemicals which is used by farmers for the controlling of pathogens. These chemicals remains on the soil for very long time. These chemicals are removed from the soil by applying high amount of water which flush out the chemicals from the soil.

Answer:

Contaminated soil can be rehabilitated by physical remediation methods, like aeration. What is another way soil can be treated to  transform soil for future generations?

From the above analogy, another way the soil can be treated to transform soil for future use is by planting fungi such as mushrooms which helps to decompose any contaminants and digest them. This will enable the soil to be useful for future generation

Explanation:

Explanation:

the person who answered is right so i say what they said

Answer No 1:

Bacterial Disease:

Common name : Typhoid

Scientific Name: Typhi

History About disease:

Typhoid can be described as an acute illness which is caused by the bacteria: Salmonella enterica serotype Typhi.

Typhoid fever was responsible for a widespread plague in Athens in 430BC. This outbreak proved to be fatal for one third of the population of Athens. It is difficult to determine the cause of plagues and infectious diseases in early history, although some speculation is usually allowed.

Jamestown, an English colony in Virginia, is also thought by some historians to have died out as a result of typhoid fever. The fever proved fatal for more than 6000 settlers between 1607 and 1624, and may have been responsible for eliminating the entire colony.

Military and war environments have often been subjected to the presence of typhoid fever throughout history. In excess of 80,000 soldiers died as a result of typhoid fever or dysentery in the American Civil War. Likewise, the Spanish-American War led to infections with typhoid both on the field and in training camps.

Answer No 2:

The bacteria that cause typhoid fever spread through contaminated food or water and occasionally through direct contact with someone who is infected.The majority of people in industrialized countries pick up typhoid bacteria while traveling and spread it to others through the fecal-oral route.

This means that Salmonella typhi is passed in the feces and sometimes in the urine of infected people. You can contract the infection if you eat food handled by someone with typhoid fever who hasn't washed carefully after using the toilet. You can also become infected by drinking water contaminated with the bacteria.

Typhoid vaccine is used for the eradication of typhoid.

Answer No 3:

Name: Ebola

Scientific name: Zaire ebolavirus

Ebola is thought to first occur in Sudan in 1976. Ir infected over 248 people.  the second Ebola virus emerged from Yambuku, Zaire, Ebola-Zaire (EBOZ).The third strain of Ebola, Ebola Reston (EBOR), was first identified in 1989 when infected monkeys were imported into Reston, Virginia, from Mindanao in the Philippines. Since then, the virus has been infecting people from time to time, leading to outbreaks in several African countries.

Answer No 4:

Ebola isn’t as contagious as more common viruses like colds, influenza, or measles. It spreads to people by contact with the skin or bodily fluids of an infected animal, like a monkey, chimp, or fruit bat. Then it moves from person to person the same way. Those who care for a sick person or bury someone who has died from the disease often get it.

Other ways to get Ebola include touching contaminated needles or surfaces.

You can’t get Ebola from air, water, or food. A person who has Ebola but has no symptoms can’t spread the disease, either.

Explanation: