_ systems have a membrane that separates the internal chemicals from the external chemical environment.
0 Living
O Chemical
both a and b
none of the above

Apart of an ecosystem that can restrict the growth of a population is referred to as

The fascicles of the deltoid are ; the fascicles of the pectoralis parallel; bipennate fusiform; unipennate multipennate; triangular bipennate; fusiform

How water is moving through the ecosystem ?