Please help me Which means a change in position?

A. force
B. speed
C. velocity
D. motion

Apart of an ecosystem that can restrict the growth of a population is referred to as

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?

Identify characteristics of energy from the sun. check all that apply. almost all of the energy on earth comes from the sun. energy from the sun is known as mechanical energy. the energy in fossil fuels originally came from the sun. plants convert the energy of sunlight into chemical energy.