The earth has a mass of about 6 × 1024 kg and orbits about the sun. as it orbits, it moves at over 60,000 miles per hour. with such great mass and speed, what keeps the earth from moving away from the sun and out of the solar system?
a. the sun's rate of rotation b. the speed at which the sun moves in the galaxy c. the sun's gravitational force d. the amount of heat that is continuously released from the sun

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.

the answer would be   10%