what are the main principles of the natural selection?​

Answers

Answer 1
(Variation.)Heritable differences that exist in every population are the basis for natural selection.

(Overproduction). Competition between offsprings for resources.

(Adaptation.) a trait that helps an organism survive and reproduce.

Descent with Modification.

Related Questions

explain when you would use a line graph

Answers

When you need to track changes over and short or long period of time

A 35-year-old bank clerk presents to your office for evaluation of fatigue. She has a 15-pack-year history of smoking and had rheumatic heart fever in childhood. On auscultation of her heart, the S2 sound is widely split; that is, it persists like that throughout the respiratory cycle. What is the most likely cause of the wide and fixed S2 split?

Answers

Answer:

I

Explanation:

Explain the need for a reference point when describing the direction of motion

Answers

Answer:

It is important as it tells if the object is stationary or in motion

Explanation:

Evan finds a rock. He scrapes it with his fingernail and leaves a scratch. His rock must be:
O a metamorphic rock
harder than feldspar
softer than diamond
made of more than one mineral
HELLP

Answers

The correct answer is C. Softer than diamond

Explanation:

Evan observation is related to the rock's hardness, which is usually measured on a scale from 1 to 10, in which 10 represents the hardest rock (diamond). In the case of the rock Evan found, the fact the rock can be scratched just using a fingernail shows the hardness of this rock is 2.5 or below because only minerals with this hardness can be scratched using the fingernail, while a higher hardness requires more complex tools.

Moreover, in this level of hardness, there are minerals such as gypsum or talc and these are softer than others such as feldspar with a hardness of 6 or diamond with a hardness of 10. In this context, it is safe to conclude this rock is softer than diamond. Also, hardness is not enough to determine if a rock contains two or more minerals or if it is metamorphic.

water molecules are polar with the

Answers

Oxygen side being slightly negative and the hydrogen side being slightly positive

what plays a key role in stimulating appetite and enabling us to taste food

Answers

Answer:

taste bud is the one that stimulate appetite and enable us to taste

Explanation:

because without the taste bud, we won't know that a particular food contain ions, acids and base

Viruses can reproduce many other viruses at once. Bacteria only reproduce one at a time.
O True
O False

Answers

Answer:

True

Explanation:

True ,viruses can reproduce many other viruses at once

7. Cockroaches are exposed to a pesticide. After 3 hours, 95% of the insects are dead

Answers

Can you be more specific to the question

Germs at Home
Article

Answers

There’s not enough information


A molecule in which one or more atoms or end is slightly negative and one or more is slightly
What word defines this
Hint: 13 letters
I WILL GIVE BRAINLY

Answers

The answer is Heteronuclear

oh its polar molecule

Which of the following is an example of positive feedback? 1.)contractions in birth. 2.) regulations of blood glucose levels. 3.) regulation of body temperature

Answers

contraction in birth

The production and transmission of hormones in the endocrine system is MOST similar to which scenario?

Answers

Answer:

You type a text message, which your friend shows to a third party, who reacts to it.

Explanation:

Copied from google.

When a message is shown to a friend who shows it to another person.

What is the endocrine system?

A group of organs called glands makes up your endocrine system. These glands, which may be found all over your body, produce and emit hormones.

Hormones are substances that communicate with your organs, skin, muscles, and other tissues through your blood to coordinate various bodily activities. These messages instruct your body on what to do and when.

The level of hormones in your blood is regularly monitored by your endocrine system. In order to transmit the message, hormones send their messages by locking them into the cells they intend to reach.

When your hormone levels increase, the pituitary gland signals other glands to stop manufacturing and releasing hormones. The pituitary gland has the ability to tell other glands to manufacture and release additional hormones when levels fall below a specific threshold. Homeostasis is a mechanism that functions similarly to your home's thermostat. Almost every process in your body is impacted by hormones.

Therefore, it is like the scenario where a message is shown to a friend who shows it to another person.

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20 POINT QUESTION!!! Does CORONAVIUS have all seven characteristics of a living thing? reproduction, ability to react to stimuli, growth & development, can process and use energy, regulation, organization/order, evolutionary adaptions?

Answers

no, it doesn't. viruses cannot reproduce without a host.

The most unsaturated fats have

Answers

Answer:

the most double bonds.

Explanation:

This is a molecule of glucose, a simple carbohydrate. If this molecule were broken down, would it provide all of the elements needed to assemble lipids, nucleic acids, or proteins? Use evidence from the diagram in your answer.

Answers

Answer:

The correct answer is - no.

Explanation:

Carbohydrates are made up of thee elements carbon, hydrogen, and oxygen so if the carbohydrate is completely broken down it will release these elements.

Lipids are made up of similar elements as glucose however, they also contain sulfur and phosphorus. Similarly for proteins and nucleic acid nitrogen, nitrogen sulfur, and selenium other than the elements released by glucose.

Thus, the correct answer would be - no.

What will happen to an ecosystem that is experiencing a prolonged drought?

Answers

If an ecosystem was experiencing a prolonged drought, there would be a big decrease in the population. All living creatures require water, even the ones well adapted to little water. There probably would be as many planets, for the ones surviving would be ones managing to get water, or ones that can survive off little water. Now on the other hand the animals then wouldn't be getting enough food or water, so then again ones who would manage to survive would be ones adapted to little water and food or are excellent hunters.

  You can also expect some animals to leave the ecosystem look for a better source of water and food.

hope this helps to some degree

The diversity, as well as the number of individuals among different species, may decrease gradually due to the scarcity of water.

What is an Ecosystem?

An ecosystem may be defined as the place or an area where organisms of different species live together and interact with one another for the purpose of food, shelter, and space.

Every living organism on the earth's surface requires water in order to fulfill its requirement for cellular and metabolic activities.

But if the ecosystem experiences a prolonged drought, the physiology of all living organisms is disturbed due to which they leave the ecosystem, hence the number of species gradually lowers.

Therefore, it is well described above.

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Sand on a beach is being continually washed farther down the shore. People who live near the beach want to stop this erosion. Which of the following structures or methods designed to deter erosion would best solve the problem?

A. groin
B. seawall
C. breakwater
D. replenishment

Answers

Answer:

The Answer is Letter A.

Explanation:

let residents build groins

How are mean and median alike?how are they different?

Answers

Answer:

Mean is the average you'll get when you add all your numbers then divide by the number of numbers you have. On the opposite side, median is the middle number within your list of numbers. If there isn't a middle number, take the two middle numbers and add them. Now, for how they are alike, I'm not so sure :'), but my closest guess would be they are fairly close together.

Sorry it's so long, hope I helped you :')

Explanation:

Age structure diagrams show the distribution of people of various ages. The diagrams also show the number of people in the prereproductive, reproductive, and postreproductive years. Research and note what else you can infer from age structure diagrams.

Answers

Answer:

Age structure diagrams show the following.

The height of the graph indicates life expectancy.

The width of the base shows birth and fertility rate.

The slope of the pyramid-shaped diagram indicates death rate.

Bends in the graph indicate reductions in birth rate or increases in  

death rate.

The overall shape of the diagram indicates whether it is an economically developed country or not.

Explanation:

In a stable human population, the age structure diagram looks like a pyramid with a narrower base. The narrower base depicts that the birth rate is low. A stable human population also has a high number of older individuals. A greater number of older people in a population shows that quality of life is high in that area/country and the population has access to nutritional diet, medical care, and healthcare services. These features of the age pyramid in a stable population indicate a developed country. Age pyramids of underdeveloped countries have a wider base (high birth rate) and narrow tip.

PLEASE ANSWER ILL GIVE ALL MY POINTS AND GIVE 5 STARTS AND A FAVRIOTE (Ty) The first step of the Nature of science is to come up with a __________________?

Answers

Hello There!!

I think the answer is:

Ask a question....

Because, Usually it's good to ask question before doing the next steps.

Here's a Explanation.

What if the person is new here and It didn't know where to go or how to do the project or the person were asking for.

And, If the person did it without don't know what to do it's good to ask question instead before doing it!

[tex]GoodLuck![/tex]

[tex]Loserbrazts[/tex]

ヾ(•ω•`)o

Answer:

the first thing that u do is make a observation and then you ask a question based on the observations you made

Explanation:

Hope this helps!

QUESTION 2
When you exercise, you get warmer. Name the process that goes on inside all the cells of your body, resulting in the production of
heat.

Answers

answer: negative feedback

explanation: negative feedback is essentially a counter action that occurs in order to maintain homeostasis within the body. if the body is too hot, it produces sweat to let off the heat (returning it to its normal temperature)

Thermogenesis is the process which produces heat in the body.

Body temperature is increased with exercise because your body's muscle moves continuously. Thermogenesis is the process through which our body's muscles, organs, and brain produce heat. Our muscles produce heat by shivering.

Hormonal thermogenesis is the process through which thyroid gland releases hormones in order to increase metabolism. This increase in the metabolism produces heat in the body and rises the temperature in the body so we can conclude that through thermogenesis our body produces heat.

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3. Phosphorus represents only 1% of human body weight. However, it is a building
block of very important macromolecules. Describe some of the cellular functions
that would not be possible without phosphorus.

Answers

Answer:

It would be impossible to store and transfer genetic information

It would be impossible to carry out majority of cellular activities due to lack of usable energy.

Explanation:

Phosphorus, as stated in the question, represents a very low amount in our body system, however, its role in living systems cannot be underestimated. Phosphorus is a vital component of major biomolecules in our system.

- It is the building block of the NUCLEOTIDES that make up nucleic acids. Nucleic acids (DNA and RNA) store genetic information and help transfer it to offsprings. However, without one of the elemental components (phosphorus) that make up its structure, it will not be produced. Hence, the storage and transfer of genetic information will be impossible.

- Phosphorus also makes up the structure of the ADENOSINE TRIPHOSPHATE (ATP) molecule. ATP provides the cell with all the energy used in carrying out cellular functions. However, the absence of phosphorus needed for the synthesis of ATP, ATP will not be produced and ultimately no energy.

How does an area's weather differ from the area's climate?

Answers

Weather is the area's day-to-day conditions and climate is the area's average conditions. a natural phenomenon that maintains Earth's temperature range.

Weather refers to the short-term atmospheric conditions, such as temperature, precipitation, humidity, wind speed, and cloud cover, that occur in a specific area over a short period of time, typically days or weeks.

Climate, on the other hand, refers to the long-term average weather patterns observed in a particular region over a period of decades to centuries.

Weather is the day-to-day variation in atmospheric conditions, including temperature, humidity, precipitation, wind speed, and cloud cover. It describes the current state of the atmosphere at a specific location and can change rapidly. For example, one day may be hot and sunny, while the next day may be cloudy and rainy. Weather conditions are influenced by various factors, such as air pressure systems, temperature gradients, and local geography.

Climate, on the other hand, represents the average weather patterns and conditions observed in a region over a long period of time. It is determined by factors such as latitude, elevation, ocean currents, and prevailing winds. Climate provides a broader perspective and encompasses the typical range of weather conditions experienced in a particular area. It takes into account long-term trends, seasonal variations, and averages of weather parameters.

While weather can change from day to day or even hour to hour, climate reflects the long-term patterns and trends in weather. For example, a region with consistently high temperatures and low rainfall throughout the year would have a hot and arid climate, regardless of occasional variations in daily weather conditions.

In summary, weather describes short-term atmospheric conditions, while climate represents the long-term average weather patterns observed in a specific area.

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Is this picture below a compound or an element?

Answers

Glucose is a compound.


Glucose is both a molecule AND a covalent compound. Glucose is made up of three elements: carbon, hydrogen, and oxygen.

the intake of food must be monitored to make sure that the cells in the body possess the essential nutrients to function​

Answers

Yes that is true it should be

7. If a growing child has deficient production of pituitary secretions, this child would
a. Develop acromegaly
b. Become a dwarf
C. Mature sexually at an early age
d. Be in constant danger of becoming dehydrated

Answers

Answer:

b. Become a dwarf

Explanation:

A decreased secretion of growth hormone can result in pituitary dwarfism which then decreases the rate of cell division of cartilage cells in the epiphyseal plate

how new technology and experimental methods can lead to changes in theories.

Answers

Answer:

New findings and new evidence about a  scientific theory can change the aspects of this scientific theory and in some cases, it can be proved as wrong or can be supported by more strong evidence that can prove its liability.

New technology allows scientists and researchers to study various untouched aspects and leads to find new evidence to support or prove the theory can be either change or unproven.

Thus, new technology and experimental methods can lead to changes in theories.

Camille was excited when the new instrument showed up at the lab. She
opened it up and started using it right away. What was her error?
A.) He used an inappropriate instrument.
B.) He used an uncalibrated instrument.
C.) He misread a measurement.
D.) He used the incorrect units.

Answers

Answer:

I would say B- it was uncalibrated

Explanation:

he did not take the time to make sure it was calibrated before use

Whole brain death occurs when the ______ ceases to function.

Answers

Answer:

Whole brain death occurs when the BRAINSTEM ceases to function.

Explanation:

In the US, whole brain death = legal death. Most people consider that a person is brain dead when the cerebrum, or the higher brain, is dead because the person is not able to think or have control over his/her body, but legally you are brain dead only when the brainstem ceases to function. The brainstem is responsible for keeping you alive and performing the most basic bodily functions like breathing and keeping your heart beating. But once it fails, you are legally dead. Even if your body could still survive using a ventilator and other devices, your brain has ceased to work and you wouldn't be able to survive if you were unplugged.

What did Adam say when he saw Eve

Answers

The man said, “This is now bone of my bones, and flesh of my flesh; she shall be called woman, because she was taken out of man.”

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