During which season of the year would a rabbit's fur be thickest?
A: winter

An organism's traits are largely determined by the genetic makeup of its parents. A mutation in which kinds of cells in a parent could cause a new trait to appear in the parent's offspring?
A: sperm or egg

Newly hatched turtles are easy prey for other animals. What is an important ability turtles have for better survival of their offspring?
A: to lay hundreds of eggs so a few will survive

When athletes begin to exercise, their heart rates and respiration rates increase. At what level of organization does the human body coordinate these functions?
A:
at the system level