A student reads that Cnidarians have two layers of tissue during development. Which answer describes a possible tissue layer?

A)deuterostome

B)ectoderm

C)radial

D)pseudocoelom

Which best explains why viruses do not have special structures or enzymes that allow them to make their own food? viruses can use energy in living cells that they infect. viruses can replicate inside a host that they infect. viruses can cause contagious illnesses in host cells. viruses integrate their rna or dna into infected cells.

Apaleontologist finds a plant fossil that shows that the plant had seeds. what can the paleontologist conclude?

Vessels draining the myocardium of the heart, open primarily ,into which chamber?