According to cell theory, all cells carry out the functions needed to sustain life. That means all cells must contain:

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

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

Color blindedness is a sex-linked trait. if we could see the pedigree chart for several more generations of the family illustrated here, we would expect a) more males to be color blind. eliminate b) more females to be color blind. c) no females to ever be color blind. d) an equal number of males and females that are color blind.