If it takes 500 seconds for the light from the sun to reach
earth, what is the distance to the sun in meters? (the speed
of light is 300,000,000 meters/second.)

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.

lipid

explanation:

what is shown in the image?

eukaryote

chloroplast

mitochondrion

submitted