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Dennis_Churaev [7]
3 years ago
9

Describing the action potential and its phases

Biology
1 answer:
Evgen [1.6K]3 years ago
3 0

An action potential is caused by either threshold or suprathreshold stimuli upon a neuron. It consists of four phases; hypopolarization, depolarization, overshoot, and repolarization. An action potential propagates along the cell membrane of an axon until it reaches the terminal button.

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Which of the following is not a natural cause of extinction?
dedylja [7]

Answer:

Introduction of Non-native species would be the answer. ( B )

Explanation:

Now let's break it down.

A. Competition due to overpopulation

Competition due to overpopulation, as competition of resources rises, species will fight among each other, and slowly, population will go down. But I don't see the reason of why it would cause an extinction... perhaps a decrease of population. See, once populations starts decreasing, resources will increase. And ONCE resources increase, populations starts increasing, and there goes competition. Resources decreases, populations decreases, and the whole process repeats. So I'm not quite sure whether it will cause extinction of a species.

B. Introduction of Non- native species.

So what does it mean by Non-native species?

It means that species that have no effect and doesn't exist in the ecosystem. So that will definitely not affect the population whatsoever.

C. Catastrophic Events

Well, common sense. Many people died of tsunamis, tornado and other natural disasters every year. Too many disasters can cause the population to cease.

D. Disease

This we can relate, especially the Coronavirus. Many humans died of the deadly virus. Same goes to animals. If a disease gets too deadly, population will decrease and drive the species to extinction.

So, the Answer would be B.

<h2>HOPE THIS ANSWER HELPED :)</h2>
3 0
3 years ago
The principle of dominance is a
Brums [2.3K]

Answer:

The Law of Dominance says that when an organism is heterozygous for a trait (meaning it has two different alleles for that gene), the allele that is expressed is the dominant one. It is one of Mendel's laws of inheritance. Unfortunately, there's no easy way to just know if an allele will be dominant or recessive.

Explanation:

Hope this helps

-A Helping Friend (mark brainliest pls)

8 0
2 years ago
HELP PLEASE ASAP
klemol [59]
Marble is formed from limestone and contains tiny interlocking grains.

Your answer is C.
5 0
3 years ago
the difference between how the lower-level organisms and higher-level organisms (fishes) are counted?
Alexxandr [17]

Answer:

I don't know sorry need kalng points HAHAHAHAHAHA

3 0
2 years ago
Allele frequency refers to the fraction of individuals with a particular version of a given gene.
Ganezh [65]

Answer:It causes random changes and the allele frequency of certain traits may increase or decrease.

Explanation:

Hope I am right

6 0
2 years ago
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