A humming bird adapts to have a long beak to reach into the flower for nectar, and a butterfly develops a long tongue to reach into the same flower for nectar is an example of ___ evolution.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

Amino acids contain the elements carbon, hydrogen, oxygen, nitrogen, and sometimes sulfur. of the 20 amino acids found in humans, 11 are called "nonessential" because they can be manufactured by the body when needed. which elements in these 11 amino acids are commonly obtained from the metabolism of sugar molecules?

This is a situation in which genes are attached to an organism's sex chromosomes; the sex of an organism influences the expression of a gene.