I know this might be selfish and all but I have a female and male rabbit and I am afraid the female rabbit is going to get pregnant I don't want her to get pregnant because rabbits have many kids what can I do to avoid my female rabbit veering pregnant?

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.

b brown mice / white sand dunes

the answer to your question is tooth decay.