Geologists found fossils in several layers within the earth and have determined, by using c-14 dating, that of all of the following layers of fossils found in the illustrated rock layers the fossils found in layer are the oldest.

Answer

In the rock layers, the fossils found in deepest layers/mantle are the oldest.

Explanation

Geological column showing rock layers is an evidence used by geologist to determine the older and younger fossils. The deeper we dig , the farther back in time we see. The oldest fossils are found at the deepest layers and the youngest  are at the top.

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.

c

explanation:

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