Protons and neutrons. But since the protons outweigh the neutrons. so your answer is d
Answer:
Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period.
D) Robert Hooke first discovered cells when observing cork under the microscope.
<span>is warmer then the north and the south poles</span>
