We should care because extinction of some species will eventually create a big imbalance in the ecosystem.
For instance, man depends on plants for food and in turn plants depend on insects such as butterfly for pollination. If the pollinating insects are wipe out, the plants we be affected and if the plants are affected human will eventually be affected.
I believe it's the hypothalamus. <span>The </span>hypothalamus<span> is a section of the brain responsible for the production of many of the body’s essential hormones, chemical substances that help control different cells and organs. The hormones from the hypothalamus govern physiologic functions such as temperature regulation, thirst, hunger, sleep, mood and more</span>
1. In your neighborhood where you would find most bacteria that causes decomposition is the ditches where you sometimes litter there.
2. Don't know #2, sorry, ask the account LifeIsAMysery, she's really smart!!!