The key role of decomposers in an ecosystem is to make available to plants.
a
energy
b
proteins
c
nutrients
d
carbohydrates

segmentation=endoskeleton=backbone=coelom=tissues

a

explanation:

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

i hope this