Why do we need to study the ecosystem

 The study of ecosystem is important for Environmental Conservation, Resource Allocation, reduce pollution and destruction of ozone layer. It provides information about the benefits of environment and judicious use of Earth's resources in ways that make the environment healthy for future generations.

Explanation:

ikr its so unnecessary unu

Explanation:

small european communities with shared traditions consolidated into large new states (apex)

the right answer is d) a conference committee. it is a temporary panel formed by house and senate members in order to reconcile differences in legislation.