Which of the following is not needed in a population in order for natural selection to act?

a.) superior strength or size

b.) genetic variation

c.)b overproduction

d.) a struggle for existence

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

In which case would a scientist choose to use a dissecting microscope rather than a compound microscope

Which statement describe events that occur during interphase?