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vodomira [7]
3 years ago
7

What percent of species become extinct when mass extinction occurs?

Biology
1 answer:
777dan777 [17]3 years ago
6 0

Answer:

Scientists estimate that at least 99.9 percent of all species of plants and animals that ever lived are now extinct.

Explanation:

(Happy to help)

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When you eat a apple your eating the hypanthium tissue it could also be the core but i dont know anyone who enjoys eating the core.
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Cladistic diagrams, or cladograms, can be used to show evolutionary relationships. An example of a cladistic diagram appears bel
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What drives deep ocean currents?
OLEGan [10]

Answer:

B) difference in water density

Explanation:

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6 0
3 years ago
Which hormone does the sympathetic nervous system release to increase heart rate.
sertanlavr [38]

The sympathetic nervous system releases hormones known as catecholamines which increase the heart rate.

<h3>What is a heart rate? </h3>

it is the number of contractions of the heart per minute.

<h3>What are catecholamines?</h3>

These are the neurotransmitters that have a catechol and a side chain that is an amine.

<h3>Which catecholamines are released by the sympathetic nervous system?</h3>

Epinephrine and norepinephrine are the catecholamines that are released by the sympathetic nervous system to increase the heart rate.

<h3>Where are these hormones released?</h3>

These hormones are released in the blood.

<h3>How does this hormone increase the heart rate?</h3>
  • "These hormones are released at the neuromuscular junction of the cardiac nerves."
  • "They shorten the repolarization period."
  • This speeds up the rate of depolarization and contraction and thus the heart rate is increased.

To learn more about sympathetic nervous system, hormones and heart rate here,

brainly.com/question/1155838

#SPJ2

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2 years ago
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A drug that inhibits the pumping of sodium and chloride ions out of the ascending limb of the loop of henle would result in
Elina [12.6K]
Hey there,

Question: <span>A drug that inhibits the pumping of sodium and chloride ions out of the ascending limb of the loop of henle would result in</span>

Answer: less water removed from the descending limb

Hope this helps :))

<em>~Top♥</em>
4 0
3 years ago
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