Birds have light-weight bones, wings, and feathers that are that allow them ti fly. They type and shape of their beaks help them to fulfill their in the environment.

Birds have light-weight bones, wings, and feathers that are hollow that allow them to fly. The type and shape of their beaks help them to fulfill their duties in the environment.

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.