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netineya [11]
4 years ago
9

A system at chemical equilibrium:_________.

Biology
1 answer:
arlik [135]4 years ago
5 0

Answer:

E) can do no work.

Explanation:

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Which molecule is correctly paired with the class of molecule to<br> which it belongs?
Kaylis [27]

Answer:

Which molecule is correctly paired with the class of molecule to

which it belongs?

Explanation:

7 0
3 years ago
The opening and closing of _____________in your heart create the lub-dub sound and prevent the backflow of blood.
iVinArrow [24]

Answer:

Heart valves or the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole and the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

Explanation:

The heart tone “lub,” or S1, is caused by the closure of the mitral and tricuspid atrioventricular (AV) valves at the beginning of ventricular systole.

The heart tone “dub,” or S2 ( a combination of A2 and P2), is caused by the closure of the aortic valve and pulmonary valve at the end of ventricular systole.

4 0
3 years ago
PLEASE HELP
Alenkinab [10]

Answer:

The ten percent rule, also known as the law of ecological tithe, has to do with the effective transfer of energy that occurs at different trophic levels, corresponding to the use of one tenth of the energy from the immediate previous level.

Explanation:

The 10 percent rule was established by the english naturalist Charles Sutherland Elton, indicating that the <u>transfer of energy from one</u><u> trophic level</u><u> to another is only 10 percent</u>. This means that the level immediately above can only use one tenth of the energy produced by the level before it.

<h3>What percentage of energy a dolphin would have after it ate a fish, that ate an insect, that ate some grass?</h3>

For example, if we say that grass produces 10000 Kcal, the insect that consumes it (primary consumer) will be able to use 1000 Kcal, the fish that consumes insects 100 Kcal and the dolphin that consumes the fish only 100 Kcal.

<em>Grass      →     Insect     →    Fish      →     Dolphin</em>

<em>10000            1000             100                   10</em>

In the end the dolphin, a tertiary consumer, will only be able to produce 10 Kcal, when in the food web the producer had 10,000 Kcal.

The 10 percent rule is not entirely accurate, since the effective transfer can be less or more than 10 percent. However, in most cases, the average energy transfer is around 10%, which complies with the rule.

4 0
3 years ago
Based on the fossil layers shown here, what can you conclude about the changes to the environment?
Serjik [45]
There used to be solid land and then something happened and a lake or just a body of water formed over it or was made over it
4 0
3 years ago
Read 2 more answers
what adaptations facilitated movement of tetrapods to land - be sure to describe challenges that these adaptations helped them o
jenyasd209 [6]

Answer:

The second neck vertebra evolved to allow rotation of the neck for moving the head left and right. As tetrapod species continued to evolve on land, adaptations included seven or more vertebrae, allowing increasing neck mobility.

Explanation:

4 0
3 years ago
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