We use pedigree charts to trace specific from one generation to the next.

Blood made up of red and white blood cells work together to form

Why do you think the puppy litter was all dark-haired?

The nervous system interacts with the endocrine system by a. using hormones as connections b. sending nerve impulses directly to glands c. using neuroendocrine cells as connections d. sending neurotransmitters directly to neurons