Lamar was taking a nap. he was startled by a noise in his kitchen, woke up, and stood up quickly. he then had a dizzy spell and sat down quickly. what best describes what happened to lamar? a. sleep causes blood pressure to rise, and when he stood up quickly he was hypertensive. b. sleep causes blood pressure to drop, and when he stood up quickly he was hypotensive. c. sleep causes blood pressure to rise, and when he stood up quickly he was hypotensive. d. sleep causes blood pressure to drop, and when he stood up quickly he was hypertensive.

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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.