Ascientist is working with methane and butane which statement best compared these chemicals?
a. they are two different types of molecules that each contain the same number of atoms.
b. they are two different types out atoms that are each made up of different of elements.
c. they are compounds made of the same two elements but each contain different number of atoms.
d. they are matter made of the same two compounds but each contain different types of elements.

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.

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