Lesson 2.2 What Are Sponges, Cnidarians, and Worms?

What are invertebrates?

• an animal with a backbone

• an animal lacking a backbone

Match the following

• annelid

• flat parasitic worms that live inside a host

• cnidarians

• a common segmented worm—an earthworm

• regeneration

• the process of growing new body parts

• sponge

• the group of invertebrates that includes corals, sea anemones, and sea jellies

• fluke

• an invertebrate with a hallow body, many small pores, and a large opening at the top

Tags

NGSS.MS-LS4-2

A (a)   helps add nitrogen and other nutrients to soil by breaking down dead plants and animals.

Tags

NGSS.MS-LS2-3

Cnidarians use (a)   to capture prey.

One method of sponge reproduction is (a)   , in which a new growth forms on the parent, drops off, and grows into a new sponge.

Tags

NGSS.MS-LS3-2

A cnidarian that is attached to the ocean floor is called a(n) (a)   .

A cnidarian that can swim or float freely and is shaped like a bell is called a(n) (a)  

Compare and contrast the methods used by tapeworms and leeches to obtain food. (Remember to answer the question in 3 sentences or more.)

Answer explanation

Leeches attach to the skin of their host and

suck blood to obtain food. Tapeworms live

inside the digestive system of their host and

absorb food eaten by the host.

Why do you think worms are relatively rare in the fossil record? (you may answer this question in 1 complete sentence.)

Answer explanation

Worms have soft bodies that do not easily

fossilize when the worms die.

Tags

NGSS.MS-LS4-1

Why do you think God told us to not eat certain animals? Provide details pertaining to what you have learned from the lesson. (To receive full points, answer the question in 3 or more sentences.)

Answer explanation

God told us to stay away from eating uncleaned animals. Some animals eat various certain things that may have parasites in them that may be deadly to us humans when consume. Tapeworms are ingested because they can be found on certain meats (such as pork.) When ingested, tapeworms grow in the digestive system and can cause many problems for it's host (such as sickness, or death.)