Karina wants to be a biologist some day. To prepare for her career, she decides to study her pet rabbit's behavior. Every evening for a month, she places half a carrot, half a leaf of lettuce, and a short stalk of celery in the rabbit's food dish. She then records which item the rabbit eats first. The chart below shows the results of Karina's multiple trials. Based on these results, Karina can conclude that all rabbits prefer carrots over celery and lettuce. her pet rabbit will likely eat lettuce first over celery and carrots. her pet rabbit will likely eat carrots first over celery and lettuce. all rabbits prefer lettuce over celery and carrots.

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.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.