Gregor Mendel proposed the law of independent assortment based on the observation that dihybrid crosses of heterozygous individuals produced progeny in a 9:3:3:1 ratio. For this observation to hold,
which assumption must be true?
A. The traits are governed by genes on different chromosomes.
O
B. The traits are governed by genes on the same chromosome.
C. The traits are governed by genes with only two alleles.
OD. The traits are governed by genes with only three alleles.

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.

answer; i believe the correct answer is (data); /// good luck

a covalent bond, specfically triple bond