lesson 9: invertebrates

Question 1

phylum porifera –> characteristics

Answer 1

include sea sponges
adults are sessile
obtain food through filter feeding
obtain oxygen through diffusion
remove waste with diffusion
no internal transport system
no nervous system –> pressure causes contractile

Question 2

phulym cnidaria –> characteristics

Answer 2

stinging tentacles arranged in circles around their mouths
sessile (polyp) and motile (medusa) stages of growing
radial symmetry
specialized cells called nematocysts that release a poisom dart to stun their prey
digest food in a garstrovascular cavity
obtain oxygen through diffusion
aceolomate
when touching something they send chemicals to the brain
fertilization is external

Question 3

phylum platethelminthes

Answer 3

flatworms
flat, ribbon like body
unsegment
bilateral symmetry
acoelomate
distinct head shape and body organisims
digestion extracellular
fertilization internal