Blood cells are _____ in shape because they lack a nucleus.

Answers

Answer 1

Answer:

Red blood cells are disc shaped. It is thought one factor that allows them to have this shape is because they do not have a nucleus. This tends to increase amount of space inside the cell for hemoglobin.

They have a flexible disc shape which helps increase the surface- to- area volume ratio which enables oxygen and carbon dioxide to diffuse across the red blood cell's plasma membrane more readily.

Their disc shape also enables them to squeeze through tiny capillaries that are half their size .

Answer 2

Answer:

Answer:

The correct answer is CONCAVE because they don't have a nucleus. I just took the test!

Explanation:

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What are three practices proven to be effective in lowering the risk of becoming infected with an STI.

Answers

STIs can be avoided by taking precautions such as not having a physical relationship with someone who has an STI, using a safe and secure procedure, washing properly, and so on. All of these precautions can help keep the STI from spreading.

What is a STI?

It is a sexually transmitted infection that can easily spread from one infected person to another during physical relationship. Some examples include syphillis, which can be passed from one person to another if the person does not maintain proper sanitation and goes to check and consult with doctors before engaging in a physical relationship.

This can be prevented by using a condom, which prevents the spread of such STIs. One should get tested for the STI disease and maintain proper cleanliness in that part of the body. One should not be involved in multiple partners because it increases the chance of being diseased.

Hence, proper preparation and sanitation should be maintained to stop the spread.

Learn more about the STI, here

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STI or Sexually Transmitted Infection is an infectious disease acquired by getting in sexual contact with an infected person. STIs can be prevented and there are many practices that can lower someone's risk of becoming infected. Here are three practices that have been proven effective:
1. Have yourself tested regularly. Regular assessment and check up is necessary once you become active in sex. This is to ensure that you are not infected since relying on symptoms is useless because it is most of the time asymptomatic. Early detection is also the aim of regular check ups.
2. Protect yourself. Always use condoms and other means of protection when engaging in sex. You will never know if your partner is infected or not.
3. Vaccinations. Vaccinations have been proven in lowering the risk of acquiring diseases. Be informed about the latest vaccines for STIs and have yourself vaccinated.

What conditions are necessary for population to remain in hardy-weinberg equilibrium?

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No natural selection
Random mating
A large breeding population
No emigration and immigration
No change in allele frequency

If you were a doctor, and a lab technician told you that the results of a patient’s lab results were Gram-positive, what antibiotics would you prescribe for the patient? Why?

Answers

Any broad spectrum antibiotics can be used against bacterial infection, but beta-lactams like penicillin, amoxicillin and cephalosporin as well as macrolides are more effective againts gram-positive bacteria.

Which one of the following statements about air pollution is FALSE?a. The United States has created restrictions to help reduce air pollution.
b. Thirty-percent of pollution in the Untied States did not originate in the United States.
c. Air pollution is only a problem in the developing world.
d. Air pollution can lead to poor health.

Answers

The statement about air pollution that is false is that "air pollution is only a problem in the developing world. Air pollution effects are reached across the globe.Air pollution comes from power plants, smog in big cities, cars, factories, and even volcanoes. Some air pollution can't be seen such as that from a swamp. A swamps methane gas contributes to the pollution. In the U.S, the EPA sets laws to help reduce the air pollution damage done by places like coal-run power plants.

The statement that describes that air pollution is only a problem in the developing world is false, i.e., option c.

What is air pollution?

The contamination of the environment can be indoor or outdoor, by any chemical, physical or biological agent that alters the characteristics of the atmosphere which is present naturally is referred to as air pollution.

Its sources can be varying, including household combustion devices, motor vehicles, industrial facilities, and forest fires are common sources of air pollution.

The statement that describes that air pollution is only a problem in the developing world is false as it can be done in the under-developed areas also through various sources including coalcombustion, etc.

Thus, the correct option is c.

For more details regarding air pollution, visit:

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Arteries carry blood ______ the heart

Answers

Away from the heart- this why they have elastic fibres

Arteries carry blood______the heart.

YOUR ANSWER==> AWAY FROM

What do organisms experience because of growing population

Answers

Competition and research partitioning

The competitive exclusion principle states that whentwo organisms attempt to fill the same niche, one will exclude the other fromthe ecosystem. Research partitioning is an adaptive evolution that when speciesare have similar preys, they compete with each other and one species is deemedto extinct in the process however if two species are of different preys, thenthey can exist with one another. To exist with one another, organisms belongingto a same species either compete for the resources or divide it amongstthemselves. This concept is important because it helps in diversified ecology,where animals and plants of the same species co-exist and creates a beauty withnature.

Answer:

increased competition

Explanation:

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Which lines in this excerpt from Guy de Maupassant's short story "Boule de Suif" show that relations between most French and German people remained friendly despite the war?A. At the end of a short time, once the first terror had subsided, calm was again restored. B. In many houses the Prussian officer ate at the same table with the family. C. By the exercise of tact the number of men quartered in one's house might be reduced; and why should one provoke the hostility of a person on whom one's whole welfare depended? D. And foolhardiness is no longer a failing of the citizens of Rouen as it was in the days when their city earned renown by its heroic defenses. E. Out of doors, therefore, citizen and soldier did not know each other; but in the house both chatted freely, and each evening the German remained a little longer warming himself at the hospitable hearth.

The largest mass extinction event in the history of the Earth occurred at the end of the _______ period. A. Ordovician B. Devonian C. Permian D. Cambrian