What is the first group of organisms to colonize an area called?

Cells destroy body cells infected by a virus or bacteria.

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.

Which rate indicates the number of children that would be born per women if she were to live to the end of her child-bearing years