2. Which of the following nucleotide bases are BOTH pyrimidines?
A. cytosine and adenine
B. cytosine and guanine
C. thymine and guanine
D. uracil and adenine
E. cytosine and uracil​

Answer:

The Marine Ecosystem is the Largest Ecosystem on Earth

The oceans alone cover about 70% of the Earth's surface or 140,000,000 square miles. The average ocean depth is about 12,000 feet and the deepest point is the Mariana Trench in the Pacific Ocean with a depth of about 32,800 feet.

Explanation:

Answer:

It allows the species to be more adaptive in certain situations. For example: A husky has a fluffy fur coat for winter while a chihuahua is built with a short fur coat because it isn't around cool climates, but both are of the same dog species.

Genetic variation helps organisms to adapt to various envrionment changes and to be resistant to diseases.

Genetic variation refers to the differences which exist between organisms of similar species due to differences in their gene content.

Genetic variation is important to organisms as it helps them to adapt to various envrionment.

Genetic variation also protects organisms from disease.

Genetic variation also helps organisms to acquire unique abilities.

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Answer:

The correct statement is liquid sample from the sampling probe containing more than twenty different amino acids.

Explanation:

The experiment is done by Miller- Urey in 1952 to create the atmosphere similar to the ancient time of earth's atmosphere to discover whether there was any similarity or not.

This experiment shows 20 different amino acids that are produced in the experiment and also gives the idea that earth's original atmosphere had different from gas that is used in Miller's experiment.

Answer:

A) Liquid from the sampling probe contained more than twenty different amino acids.

Explanation:

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The common source of groundwater pollution is done by spraying crop fields with pesticides.

Answer: Option C

Explanation:

The ground water pollution is the mixing up of pollutant in the water which lies below the ground and is potable in nature. This pollution has the commonest source of pollutant by the pesticides.

The crop fields when sprayed for pests with pesticides in order to kill the pests on crop, contaminates the crop as well as the ground at the same time. These are its disadvantages.

The ground being contaminated on ploughing or by leaching gets the pollutant into the water table. Plant on the other hand on decaying leaves the pesticide into the ground which in turns goes into the under ground water.

Spraying crop fields with pesticides is the common source of groundwater pollution.

Explanation:

Groundwater is naturally found in aquifers or geological water structures which stores water deep in the ground.

The most common contaminant of groundwater is spillage and seepage of excessive chemicals from industries and agriculture.

Agriculture which is done in large scale in many parts of the world implies the use of a large number of chemicals in the form of pesticides, weedicides, fertilizers, growth promoters etc. these are either sprayed as foliage sprays or added to the ground directly for the roots to absorb.

The excess chemicals applied to enter the ground surface and mix with the surface water and enter into the ground and mix with the groundwater. Thus the entire natural aquifer in that area becomes easily contaminated with chemicals.

The characteristic of Sun is about three times the size of Earth. Hence the correct option is c.

The characteristic of our Sun indicated in option C is that it is about three times the size of Earth. The Sun is a G-type main-sequence star, classified as a yellow dwarf. While it appears much larger and brighter than Earth, its diameter is approximately 109 times that of Earth, making it about 333,000 times more massive. The Sun plays a central role in our solar system, providing the gravitational force that keeps planets in orbit and the energy necessary for life on Earth through the process of nuclear fusion in its core. Understanding the Sun's size is fundamental in appreciating its significance and influence on the dynamics of our solar system.

In addition to its size and temperature, the Sun contains about 99.86% of the total mass of the solar system, with the majority of this mass concentrated in the form of hydrogen and helium. The Sun's gravitational influence governs the orbits and movements of the planets, moons, asteroids, and other celestial bodies within the solar system. Hence the correct option is c.

Complete question:

Which of the following is a characteristic of our Sun?

A. It is a red dwarf star.

B. Its temperature is 15 million degrees Celsius.

C. It is about three times the size of Earth.

D. It contains 10% of all the matter in the solar system...

If new housing developments are built in nearby areas and the forest fragmentation continues, then the animal population will be harmed (Option A).

The expression 'forest fragmentation' makes reference to the removal of certain natural sectors in the forest that generate patches in these areas.

In conclusion, if housing developments are built in nearby areas and the forest fragmentation continues, then the animal population will be harmed (Option A).

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Answer:

23 chromosomes

Explanation:

A human body all together has 46 chromosomes but sperm and egg cells are gametes, or sex cells meaning each half of a parent created 46 all togehter. They are haploid cells while everything else are diploid.

Answer:

In sperm cell and egg cell contain half number of chromosome so that's why sperm cell and egg cell are known as haploid cell i. e. 1n. Haploid cells only found in meiosis (sex cells).

For example, in human beings the number of chromosome in sperm cell is 23 and also 23 in egg cell. When the sperm cell combine with egg cell, diploid cell is formed i. e. 2n. In diploid cells the number of chromosome is double.

Explanation:

Explanation:

Answer:

grass

Explanation:

grass produces the main source of energy for the food chain

A producer is someone who creates and supplies goods or services. The plants and algae can make their own food using energy from the sun. Here grass is a producer. The correct option is A.

There exists unique interactions and relationships that are involved in the energy transportation. The energy once produced and captured is distributed through various living organisms. This transfer of energy is termed as the food web.

The food web explains how food chains overlap. Both the food chains and food webs shares three types of organisms in a food chain: producers, consumers and decomposers.

The organisms which can synthesize their own food and generally serve as the foundation for all food chains are called producers. Some of the examples of producers are plants, algae and bacteria. Here grass is a producer.

Thus the correct option is A.

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Answer: The answer would be D. The palms are prone. Trust me i'm 100% positive.

Explanation: Prone position is a body position in which the person lies flat with the chest down and the back Concerning the forearm

Final answer:

The answer is D. The palms are prone. This is incorrect because, in the anatomical position, the palms should be facing forward (supine), not downward (prone).

Explanation:

The characteristics of the anatomical position include all of the following EXCEPT: D. The palms are prone. In the anatomical position, the body is standing upright, with the feet at shoulder width and parallel, toes pointing forward. The upper limbs are held out to the side with the palms of the hands facing forward.

When the palms are prone, it means they are facing downward which is not consistent with the standard anatomical position, where the palms face anteriorly (forward). Instead, when the palms face forward, they are in a supine position. Therefore, option D is incorrect as it contradicts the standard anatomical position.

As the temperature of the water increases, it will be affecting water quality, coral reefs, making native species more susceptible to die-off from competition with invasive species and in some cases more at risk of disease.

Explanation:

Answer: Species B will survive and Species A will die out.

Explanation: I just got it right

Answer: Internal stimulus

Explanation: There are two basic types of stimulus: external and internal stimulus. External stimuli are changes to conditions in the organism's physical environment. An internal stimuli are changes to conditions from inside the organism. Examples of internal stimuli are hunger, thirst, and sleepiness.

Internal stimuli such as changes in glucose levels or temperature are detected by specific receptors in the body. These receptors transduce the stimuli into signals which are relayed to the brain. The brain then initiates an appropriate response to maintain homeostasis.

A stimulus type that occurs within the organism's body is often related to the internal changes such as glucose levels, temperature or hormonal changes. These stimuli are detected by specific receptors. For example, glucose levels are monitored by specific endocrine cells in the pancreas.

Upon detecting higher glucose levels in the blood (the stimulus), these pancreatic beta cells release the hormone insulin. This hormone travels throughout the body, binding to the receptors of target cells, such as skeletal muscle fibers, fat cells, and liver cells, stimulating them to absorb the excess glucose.

Receptor cells transduce these internal stimuli into signals. They can be categorized on the basis of type of stimuli they transduce, such as chemical stimuli through a chemoreceptor, or temperature changes through a thermoreceptor. This information captured by the receptors is then conveyed to a control center, typically the brain, which interprets the signals and orchestrates an appropriate response to maintain homeostasis.

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B) Businesses might invest in places that lack environmental regulations.

Explanation:

Answer: alt answer: there would be a financial incentive to protect the environment

Explanation:

Answer:

meiosis

Explanation:meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction.

The process of cell division for reproduction is meiosis, which results in four diverse gametes or sex cells with half the number of parent cell chromosomes.

The process of cell division that produces cells necessary for reproduction is called meiosis. Unlike mitosis, which creates two identical cells, meiosis yields four genetically diverse cells, referred to as gametes or sex cells (sperms in males and eggs in females). These gametes contain half the number of chromosomes of the parent cell and combine during sexual reproduction to form a new organism.

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Answer:

The sensory input (afferent) of the reflex is from two structures in the muscle called spindles and Golgi tendon organs. The output (efferent) is the alpha motor neuron that contracts (tightens) the muscle. (The muscle fibers are sometimes referred to as extrafusal fibers.)

Explanation:

Answer:

the intensity decreases because the sound has to stretch more and becomes more quiet

Explanation:

with more distance the sound waves start to lessen and almost stretch out and cover more distance but lessen in intensity due to the stretching

Final answer:

Sound intensity decreases with distance due to the energy of the sound wave being spread over a larger area and absorbed by objects, following the inverse square law.

Explanation:

Sound intensity decreases as the distance from the source increases primarily due to the phenomenon where the energy of the sound wave is spread over a larger and larger area. This spatial distribution of energy is well explained by the inverse square law, indicating that sound intensity is inversely proportional to the square of the distance from the source. In an unobstructed environment, sound emitted from a point source spreads out in a spherical manner, leading to a decrease in sound intensity with increasing distance.

In addition to this spatial dispersion, sound energy is also absorbed by objects and converted to thermal energy due to the viscosity of air, and during sound wave compression and rarefaction cycles, heat is transferred to and from the air, further reducing the organized energy into random thermal motions. These effects contribute to the decrease in sound wave amplitude, and subsequently, sound intensity as the distance from the source increases.

Answer:

Natality

Mortality

Immigration Rate

Emigration Rate

Answer:

Natality(birth rate)

Mortality(death rate)

immigration rate(the rate of moving in a popul.)

Emigration rate(the rate of moving in a popul.)

Explanation:

Answer:

1 honeybee

2 scorpion

3 lizard

4 frog

5 ostrich

6 goldfish

7 bear

8 clam

Answer:

The Dad must give a Y chromosome

Explanation:

To have a male child there must be an X and Y chromosome

Answer:

The Dad must give a Y chromosome

Explanation:

Answer:

bones

Explanation:

The question asks about the electronic configuration of atoms. Each option presents an atom with a specific electron arrangement. Using the concept of stability where an atom is considered stable with eight electrons in its outermost layer, Neon is most stable.

The statement is asking which atom arrangement best represents how electrons are arranged in energy levels or shells in an atom. This concept is linked to the electronic configuration of an atom. Neon has two energy levels, and its second energy level contains eight electrons, making it a stable atom. Chlorine has three energy levels with seven electrons in the third level, which means it is one electron short of becoming stable. Gallium has four energy levels and three electrons in the fourth level. Tin has five energy levels with four electrons in the fifth level.

The stability of an atom is determined by its electronic configuration. In most stable cases, atoms have eight electrons in their outermost energy level. Applying this rule, Neon appears to be the most stable atom in this scenario.

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Answer:

27.5

Explanation:

Answer:

D

Explanation:

it would be d as when organisms or plants die they would decay and the energy and nutrients and carbon would then be broken down and absorbed by the soil

The statement best describes the cycling of carbon between the atmosphere and hydrosphere is " Movement of gases from the ocean's surface by diffusion "

A Hydrosphere is the total amount of water present on a planet.

A Hydrosphere include water in all form that is in solid, liquid and gas.

Example: Water present in lake, river ,ocean etc.

Water present in ice form on the earth.

Water present in vapor form.

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Answer:

Think foxes eat rabbits. The more rabbits than the more foxes have to eat which will cause a decrease in rabbit population and likely an increase in fox population.

Explanation:

Rabbits and foxes have a predator-prey relationship. If a community has an abundant number of rabbits, then the population of foxes in that area will also increase as there will be abundant food for them. As the population of foxes increases, the population of rabbits will start to decrease as there will be more predators to feed on them. Hence, if the population of foxes keeps on increasing, rabbits may migrate or become completely eradicated from that particular area.

I have added the pictures found from another source

Answer and explanation:

If we compare the images, we will realize that there was a little or no vegetation in 1983. However, in 1989, there were shrubs or some plants growing. As mentioned in the statement, there was an eruption in 1980 and so the conditions were not favorable for plants to grow even after 3 years. However, in 6 more years, there was a slow plant growth because the harsh environmental conditions were diminshing and favorable conditions started developing. This process of slow growth has been recognized as a Ecological Succession in biology.

Answer:

Fossils are usually named based on the following conditions-

These fossils are again categorized into different groups depending on the similarity in terms of form.

These names of the fossils are important to the comparative anatomists because it helps them in doing the comparative study and understand the causes of similarities and dissimilarities in terms of anatomy and also helps in understanding the evolutionary process of these organisms. For example, the fossil named 'Ida' is the primitive fossil that was found to be almost completely preserved. This fossil helped in comparative studies with other fossil species in a number of ways.

Answer:

The fossil is the oldest human ancestor ever discovered. It’s also the most complete fossil primate ever found. Scientists can compare its skeletal structure to that of humans and other primates to find evolutionary similarities and differences. They can possibly find early evolutionary connections to other organisms too.

Explanation:

Sample answer

City-state government was often conquered because they did not have enough resources to protect themselves

Explanation:

A city-state government is an independent autonomic political system which usually compromises just a single independent city which is governed by itself with sovereignty over its territory. The city-states like Greece, Italy, and Rome etc became very powerful.

The main reason for these city-states being conquered more was the accumulation of wealth and aristocracy in such states.

Heavy taxes, religion, slavery also lead to social unrest and conflicts among these city-states which made them weaker.  These internal conflicts also made them lose their resources and vulnerable to be conquered by other powerful empires.

With the increasing power of neighboring states, like in the case of Rome and Greece, the Romans became mightier than Greeks at one point and conquered the Greek city-states.

Specification of Null hypothesis, alternate hypothesis,setting level of significance, calculation of test statistics and P value, making conclusion.

Explanation:

When you are in a need to compare two or more groups in statistics, you have to use testing of hypothesis. There are two important things that is to be considered in the testing of hypothesis. First is the size of the sample that you choose and the extent of variability in the sample. This is useful for the determination of the differences that exists.

Testing of hypothesis helps in doing this. This can be done with the help of Five steps like, specification of Null and Alternate hypothesis. from this two, one will be selected at the conclusion. Then the next step will be, setting the level of significance. Third is the calculation of P value and the test statistics. This will be compared and at last, either Null or Alternate hypothesis will be selected.