How are the respiratory and circulatory systems similar?

A - Both systems provide glucose and other substances to cells.
B - Both systems regulate blood flow throughout the body.
C - Both systems help remove carbon dioxide from the body.
D - Both systems send messages to the nervous system for breathing.

It's B.

Explanation:

Both circulate blood flow throughout the body

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: