28 The populations of the two species increase and decrease based on the numbers of each species present. This relationship is an example of
(1) ecological succession
(3) interdependency
(2) an energy pyramid
(4) competition
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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.

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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