Which statement is the best decription of how blood circulates through the body? A. The circulatory system pushes blood upward throughout the body
by using gravity

B. The heart contracts and relaxes causing a force to push the blood
throughout the body.

C. The respiratory system pulls the blood inward when inhaling and
pushes it outward when exhailing.

D. The blood circulates throughout the body by gravity only.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation:

1. is geographic distribution

2 is increasing complexity

3 is transitional forms