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Snowcat [4.5K]
3 years ago
9

Someone please help me​

Biology
1 answer:
Brums [2.3K]3 years ago
7 0
I think because there are no nutrients like nitrogen in rock sand and volcanic ash‍♀️
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Write an example of an environmental stimulus
Lerok [7]
Anything that can be seen, touched, tasted, smelled or heard. it might also involve the sense of proprioception, such as the movement of the arms and legs or the change in position of the body in relation to objects in the environment .

 ex - A car drives past with the window rolled down and the music blasting, Another would be , A duck splashes in a nearby pondd .

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6 0
3 years ago
What term is used to describe 100’s or 1000’s of amino acids chemically combined?
hjlf

Answer:

Polypeptide

Explanation:

Amino acids are the building block and simplest unit of protein molecules. The structural composition of each amino acids is made up of an amine group (-NH2), a carboxylic acid group (-COOH), a hydrogen atom (H) and a R side chain that differentiates every amino acid from one another.

In a reaction process called condensation, amino acids are chemically joined together via the amine group of one and the carboxylic group of another. This process releases water molecule (H20) to form a bond called PEPTIDE bond between the amino acids. Several amino acids in their 100’s or 1000’s that are chemically joined this way forms a POLYPEPTIDE chain, which in turn forms the protein molecule.

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3 years ago
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Dmitry [639]
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The length of the day changes throughout they year; day is equal to night (12 hours each) during the solstices on March 21 and September 23 but during summer day is longer than night in the northern hemisphere; during winter it is smaller. THe smallest daylength is at December 21st (in the northern Hemisphere). This phenomenon is due to the tilt of the axis of the earth.

The correct answer is December 21; (if we talked about a place in the southern hemisphere, the answer would be March 21).
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Answer:

c d

Explanation:

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