Ia lab you viceued the movement of two different opes of worme black woms (ennel

Question

Ia lab you viceued the movement of two different opes of worme black woms (ennelide) and poato worme Deacribe the differences you saw in the movement of these rao woms. dap Why do you think that paraitic species have reduced semsory smucuzes when compared to frse iving p compared to free-living species? free-diving specis?t 4. In lab this week you saw examples of sessile (non-moving) animals a. Name one sessile animal that you viewed in lab. as b. Describe one way it can deind inself from predation During the earthworm and crayfish dissections you viewed rwo different oypes of circulatory systems a. What is the diffèerence berween an open circulatory system and a closed circulatory system? n.opit b. Considering the lifestyle of an earthworm, what advantage do you think a closed circulatory system might have for this species? (topin 6. While crayfish and earthworms both have complete digestive tracts, there are notable differences in their digestive systems a. Describe the structural differences in the mouth of a crayfish and of an earthworm. gpin b. Why do you think crayfish have specialized mouth appendages? g0 pin

Explanation / Answer

5 b. The advantage of closed circulatory system in earthworm is that

6 a . The mouth of cray fish has three sets of appendages called maxillipedes that help in breaking the food and has mandibles that act like human jaw by helping to chew shells of other animals as these fish are carnivorous.

In earthworm the mouth is just an opening for the entry of food where muscular pharynx grabs the food and passes the food to esophagus.

6 b . Crayfish's appendages around the mouth helps to hold, tear and pass food to mouth while it eats.

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