1. is the evolutionary history of a species or group of species.2. can produce similarities in body form when similar environments and natural selection have favored similar adaptations.3. distinguishing between homology, which reflects common ancestry, and , which does not, is critical in determining evolutionary relationships.4. a(n) is a group of species that includes an ancestral species and all of its descendants.5. distinguish clades and thus branch points in the tree of life.6. the use of dna and other molecules to determine evolutionary relationships is

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the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.