1. What factors are in an ecosystem?

There are biotic factors which are living things or things that used to be living(fish, birds, etc), and abiotic factors which are things that are not alive and have never been alive(rocks, water, etc).

Explanation:

brain development. a child's brain undergoes an amazing period of development from birth to three—producing more than a million neural connections each second. the development of the brain is influenced by many factors, including a child's relationships, experiences and environment.

explanation:

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.