The belief that children's immune systems need to be exposed to viruses and bacteria in order to strengthen them, but that children are overprotected from this exposure, is called the

answer: i say it foxes

explanation:

you need to give us the answer options to for me to offical decide.

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: