Act as signals or markers to cells recognize one another.

Which of the following is a good definition for the word adaptation? question 1 options: a trait that an organism survive and reproduce in its environment. a change in an organism's environment. the way in which animals obtain food. a temperature change that can cause the extinction of plants and animals.

Describe characteristics of a good respitory surface

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.