12. In what direction does blood flow through the heart? A. Up and down
B. Right to left
C. Slow then fast
D. Fast then slow

B

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gesture

Explanation:

Right to left

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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:

69 is the correct math for the amino acids