How much does a human brain weigh?

The brain is the body's control center. Weighing about 3.5 lb (1.5 kg), it consumes more than 20% of the body's energy.

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: