<span>The answer is: at the level of population. A population is a group of organisms of the same species in an area. Here, we have a group of butterflies of the same species laying eggs on milkweed plants. Therefore, butterflies laying their eggs on milkweed plants occurs at the level of population. </span>
When frying an egg, the protein albumin denatures and maintains only its primary structure. The simplest level of protein structure is the primary structure which is simply the sequence of amino acids in a polypeptide chain. The order of a protein is resolute by the DNA of the gene that encrypts the protein or that encodes a portion of the protein, for multi-subunit proteins. An alteration in the DNA of the gene sequence may principal to an alteration in the amino acid order of the protein. Even altering just one amino acid in a sequence of a protein can affect the protein general assembly and purpose.
Option D is the correct answer.
To what extent has the presence of a true coelom in animals changed over the course of evolution?
A coelom is a body cavity that is formed from the mesoderm tissue.
Option D - The presence or absence of a true coelom appears to have changed multiple times during the course of evolution.
