Gravity is<span> the force that pulls vehicles toward Earth. It depends on the mass of the object. The bigger the mass the bigger the gravity force. </span>
Gravity has a higher effect on heavy, large and high profile vehicles. The heavier the vehicle the bigger the force that pulls the vehicle toward Earth.
1). secondary; physical and thermal and radiological
2). primary; chemical radiological
3). secondary; physical and biological
I believe the answer is c. because of Darwin's theory of evolution..
C. Commensalism
"An association between two organisms in which one benefits and the other derives neither benefit nor harm."
