B: Cells are the basic operating units of living organisms.
I think it is A and D (at least those are the ones that made the most sence to me).
If you were to remove the decomposers all of the dead plants and animals on the ground floor would remain there and cause a build up of dead animals and plant matter not being removed via the decomposers
I believe the answer is echinodermataechinodermata and Chordata have a very similar embryonic development; tirhe first opening (the blastopore) becomes the anus, while in protostomes it becomes the mouth and several similarties in the formation of skeleton.It is predicted that Echinodermata and Chordata evolved from the same ancestor
