(2) n
(b)
The secondary structure of a polypeptide is produced by bonds between amino
acids.
Describe how.

The  secondary structure of a protein is generated by hydrogen bonds between atoms of the polypeptide backbone.

In conclusion, the secondary structure of a protein is generated by hydrogen bonds between atoms of the polypeptide backbone.

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The order in which the amino-acids are placed within the polypeptide determines the tertiary structure and therefore the function of the given protein. Amino acids have different functional groups like methyl(CH3), phenyl(C6H5). Those functional groups can interact with molecules like glucose determining reactions, the proteins that catalyze reactions are called enzymes. Other functional groups of amino acids can be the sulfate groups. For example, insulin has 2 polypeptide chains(Chain A has 21 amino acids, and chain B, 30). Between the two polypeptide chains, 2 disulfide bonds form altering its shape.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

the answer would be d : p