(d) by finding the absolute age of the rock
Explanation:The relative age of a rock is not an exact number or age; rather it's the comparison of one rock or fossil to another to determine which one is older or younger. Scientists use carbon dating to calculate the age of a rock. Organic material from the rock is tested and that information is used to calculate the estimated age.
C) Rock layers
Explanation:The Fossil Record and Geologic Time Fossils of plants and animals are present in some rocks. These fossils contribute to our understanding of geologic time and they show us the time span when and how a civilization used to live.
Answer to Q3:
(c) They get a sense of the history of the area they are investigating.
Explanation:Fossils scaled into rocks are fundamental to the geologic time scale. For instance rocks formed during the Proterozoic Eon may have fossils of relative simple organisms, such as bacteria, algae, and wormlike animals while Rocks formed during the Phanerozoic Eon may have fossils of complex animals and plants such as dinosaurs, mammals, and trees.
Answer to Q4:
(a)the appearance and disappearance of groups of organisms
Explanation:the appearance and disappearance of groups of organisms in different geological eras of earth history shows the time span of that era. This time span can be easily determined from the fossils present on sedimentary rocks because they show the family or group of those species which were present in that particular time period.
Answer to Q5:
(d)radioactive dating
Explanation:Scientists use radioactivity techniques to determine the age of earth. As we know radioactive substances emit energy continuously and they have a certain half life period so calculating the half life period can show us the age of earth by comparing the half lives of different radioactive elements. For example in uranium-lead dating, for instance, the radioactive decay of uranium into lead proceeds at a reliable rate.
Answer to Q6:
(c)Sedimentary
Explanation:Mostly sedimentary rocks like limestone and shale are the best options in the formation of fossils. Igneous rocks are formed directly from hot lava that is why they would not be able to preserve any remnants of living organisms that fall in it during its formation.
Answer to Q7:
The granite is older than the sandstone.
Explanation:The principle of inclusions states that with sedimentary rocks, if inclusions are found in a formation, then the inclusions must be older than the formation that contains them. So in simple words pieces of the older rock will be included in the younger rock therefore option B is the correct answer.
In guinea pigs, dark hair (D) is dominant over light hair (d) and curly hair (C) is dominant over smooth hair (c). Complete a dihybrid cross for parents with the genotypes: DdCc × DdCc and answer the following in complete sentences.
1. Describe how you would set up a Punnett square for this cross.
2. List the likelihood of each possible offspring genotype.
3. List the likelihood of each possible offspring phenotype.
Which of the following is a major step involved in the formation of life from non living things
A. The formation of oxygen molecules.
B. The formation of water.
C. The formation of hydrogen molecules.
D. The formation of hydrogen molecules.
Answer:
The correct answer will be option B (The formation of water).
Explanation:
It is difficult to determine origin of life because of the lack of facts which supports the origin of life and theories are mostly hypothetical. But with fossil evidence and radiometric dating of the oldest rocks, we can assume that life began at least 3.5 billion years ago.
Life originated in presence of water as:
1. Geological evidence shows that liquid water might have been present on Earth 4.3 billion years ago.
2. Properties of water providing medium for reactivity, its ability for H-bonding, heterogeneous catalysis and self-organization supported life.
3.Evidence shows that earliest form of life in the tree of life were hyper-thermophilic and thermophilic complex bacteria which lived in systems composed of hot water system such as hydrothermal systems found in areas of volcanic activity.
Thus, life must have water. So, option B is the correct answer.
While assessing the client's skin, a nurse notices a skin condition, the pathophysiology of which involves increased visibility of oxyhemoglobin caused by an increased blood flow due to capillary dilation. which condition is associated with this client?
What is the contribution made to the development of the microscope by Max Knott and Ernst Ruska? first to document careful observations of different cell types identifying the first cell used mathematics to improve the focus of the lens created the first microscope discovered the electron microscope built microscopes capable of magnification of up to 1250 x using regular light
What capillaries have endothelial cells pierced by filtration pores that allow the rapid passage of small molecules?
How can zoning laws be beneficial to a city’s residents? a. They prevent new business development. b. They can prevent new development that would harm established residents. c. They limit the maximum height of buildings. d. They restrict who can live in a city.
The right option is; b. They can prevent new development that would harm established residents.
Zoning laws are laws that are created to specify the areas in which commercial, residential, industrial, or recreational activities may occur. Zoning involves grouping land in a town into zones in which certain land uses are prohibited or allowed. Through zoning, the governments regulate the physical development of land and buildings, and restrict how people can use their properties.
Zoning method helps in preventing the new development that would harm the established resident.
Further Explanation:
Zone law is described as the use of land. It is also stated as the use and development of real estate. The zoning regulation helps in restricting the area of development by municipalities. New York City adopted this idea in 1916.
The common idea of developing the zoning method is to divide the function of the municipality into commercial, residential and industrial. These parts are separated from each other and the use of the property is uniform. They allow the requirement of the type of building, address the utility lines, determine the height and size of the building and they also limit the number of rooms. It also includes the frontage area or lot, front, back and side yard and it also minimizes the lot area. The regulation also restricts the area of a single family to areas to multiple families. The zoning regulation helps in preserving the historical or cultural heritage and the green covering.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Environmental science
Keywords:
Zone, land, estate, zoning, municipality, commercial, residential, industrial, uniform, historical, cultural, building.
N a simple mendelian monohybrid cross, true-breeding tall plants are crossed with short plants, and the f1 plants, which are all tall, are allowed to self-pollinate. what fraction of the f2 generation will be both tall and heterozygous?
When platelets attach to collagen threads in an injured vessel the platelets swell, form extensions and then stick together. as a result of these steps what structure is formed?
Before the plug forms, a platelet will stick to the blood vessel (adhesion), change its shape and signal other platelets to come help (activation and secretion). Then they stick to each other (aggregation).
Platelet swell, form extensions, and stick together upon contact with exposed collagen and underlying connective tissue in a damaged vessel, forming a platelet plug. This is part of the body's natural hemostasis and is assisted by von Willebrand factor and other substances released by platelets.
When platelets attach to collagen threads in an injured vessel, they undergo a series of transformations. They swell, form extensions, and then stick together to initiate the formation of a platelet plug. This process involves the activation of platelets by chemicals released from the injury site and contact with underlying collagen. Platelet plug formation is a crucial step in the body's natural hemostasis mechanism. von Willebrand factor assists the platelets in adhering to the collagen and endothelial lining, which stabilizes the growing platelet plug.
As more platelets accumulate, they release additional substances into the plasma that promote the coagulation process, such as thrombin receptors which enable the conversion of soluble fibrinogen to fibrin, creating a mesh that hardens and contracts to complete the clot. This is the cellular response to vessel injury and is indispensable for preventing excessive blood loss.
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Earth's oceans contain many dissolved elements like calcium, sodium, and chlorine. These elements plus several others combine to form the salts in the oceans.
What is a major source of calcium and sodium in oceans?
A) air pollutants
B) gases from active volcanoes
Eliminate
C) minerals dissolved in aquifers
D) weathering and erosion of rocks
The right answer is D) weathering and erosion of rocks.
Sodium (Na) exists mainly in the oceans in the form of sodium chloride NaCl. This salt is derived from mines or saline rocks, by erosion of rock evaporite salt called rock salt or halite.
Calcium (Ca) exists mainly in the form of limestones, which are sedimentary rocks, just like sandstones or gypsums, easily soluble in water (see karst), composed mainly of calcium carbonate CaCO3, but also magnesium carbonate MgCO3.
Most genetic diseases result from mutations that cause a gene to produce a non-functioning ______________, which in turn blocks the functioning of a metabolic pathway
The term coined to signify a drop in testosterone levels in older men is:
Prochlorperazine is prescribed postoperatively. the nurse should evaluate the drug's therapeutic effect when the client expresses relief from:
Boxlike shape, green organelles, and a nucleus off to the side. what type of cells were these?
Scientists are conducting eDNA surveillance. Why would the scientists use a control sample that is known to be from bighead carp?
A: To see if samples contain the same DNA
B: To increase the number of DNA strands
C: To identify a new species of carp
D: To produce multiple banding patterns
The answer is A. to see if samples contain the same DNA.
Answer: Option A
Explanation: This method employed for the surveillance for the detection of any invasive species in the water sample.
A control sample of the Bighead Carp is used as a control to check whether the sample that is tested includes the same DNA or not.
This method is used to find out whether the sample which is used for testing includes the DNA of any invasive species.
________ is the arrangement in which two dissimilar organisms live together.
why is the body farm important to the field of forensics
Which of the following life processes has evolved and been conserved through nearly every modern organism?
Answer:
Metabolism
Explanation:
I had the same question
Where is michael holtzapfel's body found? at the local cemetery. in a shop. by the riverbed. his body is never found?
Students planted three bean seeds. after several days, they observed that the seeds' roots were growing downward into the soil. which type of topism were the roots displaying?
Describe two ways in which analog and digital signals are boosted.​
Which macromolecule includes steroids?
a.lipids
b.proteins
c.carbohydrates
d.nucleic acids?
Answer:
a
Explanation:
Which is not be a mechanism through which an infectious disease can emerge?
a. decreased transmissibility
b. different portal of entry
c. increased incidence
d. increased virulence?
Which model of eating disorders includes a "core pathology"?
The model of eating disorders that includes a "core pathology" is the Cognitive-Behavioral Model (CBT) of eating disorders.
According to CBT, an individual's thoughts, beliefs, and attitudes about body image, weight, and food are dysfunctional. This underlying disease causes and maintains disordered eating and skewed cognitions.
Eating disorders are characterised by negative and illogical attitudes about body form, weight, and food, which lead to maladaptive behaviours such restrictive eating, binge eating, and purging, according to CBT. Disordered eating is caused by these problematic ideas.
CBT uses cognitive restructuring to uncover and correct these incorrect attitudes and beliefs, improving food, body image, and self-esteem. CBT targets the core disease to modify behaviour and help eating disorders recover.
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The theory that the brain regulates body weight around a genetically predetermined level is identified as
One section of a strand of dna has the bases sequence agattc. what is the base sequence on the other strand?
Final answer:
To determine the sequence of the complementary DNA strand, one must use the base pairing rules: A pairs with T, and C pairs with G. Given the sequence 5'-AGATTC-3' on one strand, the complementary sequence is 3'-TCTAAG-5'.
Explanation:
The subject of this question is Biology, specifically focusing on genetics and the structure of DNA. When given a sequence of one DNA strand, it's crucial to understand base pairing rules to determine the sequence of the complementary strand. DNA strands are antiparallel; they run in opposite directions. Hence, when one strand has the sequence 5'-AGATTC-3', we look at the base pairing rules where adenine (A) pairs with thymine (T) and cytosine (C) pairs with guanine (G) to find the complementary sequence. Using this information, the sequence of the complementary strand corresponding to 5'-AGATTC-3' would be 3'-TCTAAG-5', reading in the antiparallel direction.
People cut down a forest to build a housing development. Describe two ways this action will likely affect the water cycle in the local environment.
The return of a cardiac muscle cell to its preexcitation resting state is called:
The return of a cardiac muscle cell to its resting state following excitation is called repolarization, which restores the cell's resting membrane potential and occurs before the refractory period.
The return of a cardiac muscle cell to its preexcitation resting state is known as repolarization. This process occurs after depolarization, where the membrane potential is restored to a negative value inside the cell. During repolarization, voltage-gated sodium channels close, and potassium channels maintain their conductance, helping to bring the cell back to its resting state. The resting membrane potential is maintained by the sodium-potassium ATPase, which pumps sodium out of the cell and potassium into the cell, maintaining the ionic gradient necessary for the next action potential. Following repolarization is the refractory period, a time during which the cell cannot generate another action potential, allowing for a controlled rythm.
An infectious disease is an infection that impairs the normal state of health.
a. True
b. False
Why does the moon look different at different times of the month
The Moon appears differently throughout the month due to its monthly cycle of phases as it revolves around Earth. This results in changes in the visible part of the Moon's illuminated hemisphere and prominent changes in the visibility of its topographic features depending on the angle of sunlight hitting it.
Explanation:The Moon looks different at different times of the month due to its monthly cycle of phases which results from the changing angle of its illumination by the Sun. This is not due to the Moon's rotation but its revolution around the Earth. Because it takes about 30 days to orbit Earth, we observe this as a shift in the Moon's visible position in the sky each day and a change in the visible portion of the Moon's illuminated hemisphere.
When the Moon is in the same part of the sky as the Sun, we see it as a new moon where the bright side is turned away from us. However, as the Moon revolves around the Earth, we start to see more of its illuminated side, resulting in a crescent moon that grows into a full moon as the Moon moves further away from the Sun's position. After the phase of the full moon, the Moon's visible light begins to decrease, transitioning back to the new moon stage.
Fascinatingly, the way sunlight hit's the Moon also impacts the visibility of its topographic features. When the Moon is at full phase, sunlight shines directly on it, creating a flat lighting scenario that doesn't cast shadows, thereby making it difficult to see the craters and mountains on the Moon. However, near first or third quarter of the moon's cycle, sunlight hits the moon at an oblique angle, casting shadows and distinctly revealing the Moon's topographic features.
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More people die of _____ cancer than of any other cancer
A. Lung
B. Skin
C. Pancreatic
D. Breast