The uniformitarian principle states that:

A. landforms are created by fast changes

B. landforms were formed by erosion and deposition

C. catastrophic events are responsible for the earth's landforms

D. the earth was once completely covered with water

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.

some of your causes might be acidic rain or natural wildfires that cause the parks to be degraded

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the answer is sex-linked recessive.