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mote1985 [20]
3 years ago
14

How long can humans hold their breath underwater?

Biology
2 answers:
san4es73 [151]3 years ago
7 0

Answer:

average 3-4 mins

Explanation:

Kazeer [188]3 years ago
5 0
The average is 3.4 minutes
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Before solar energy can become a competitive form of energy available for consumers, which of the following events must occur? A
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The answer is; D


Solar cells usually convert solar energy into electricity which could later be reserved. The efficiency of solar cells is still low, compared to other sources, with a conversion rate of 15% - 22%. This reduces the attractiveness of solar cells as a competitive source of energy. This also makes this form of energy expensive due to its inefficiency.


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Lobe-finned fishes are characterized by lobes in their fins in addition to the basic characteristics of fishes.

<h3>What are lobe-finned fishes?</h3>

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More on lobe-finned fishes can be found here: brainly.com/question/7849168

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2 years ago
In the food chain below, which is the producer? flower , mouse, snake,hawk
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3 years ago
Which muscles assist in inhalation when running up the stairs? A) sternocleidomastoid, pectoralis major, scalenes B) sternocleid
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During normal inhalation, contraction of the diaphragm and the contraction of external intercostals expands the chest cavity. The increased volume of the thoracic cavity results in reduced alveolar pressure than the atmospheric pressure to facilitate the flow of air into the lungs in response to the pressure gradient.

During deep inhalation as it occurs when running up the stairs, the accessory muscles of inhalation also participate to increase the volume of the chest cavity. The contraction of scalene and sternocleidomastoid muscles increase the volume of the chest cavity further to create a greater drop in alveolar pressure.

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3 years ago
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