Invertebrates

Question 1

• (Sponges) are sessile, filter feeders that lack true tissues

Answer 1

Porifera

Question 2

• Radially symmetrical, diploblastic animals with a gastrovascular cavity
• Corals, jellies, and hydras belong to this phylum

Answer 2

Cnidaria

Question 3

• Includes flatworms with a simple nervous system and saclike gut

Answer 3

Acoela

Question 4

• Trichoplax adhaerens, the only species, is composed of a bilayer of a few thousand cells
• They reproduce by dividing into two or budding off many multicellular individuals

Answer 4

Placozoa

Question 5

• (Comb jellies) are diploblastic, radially symmetrical animals
  They have eight “combs” of cilia that propel them through the water
• Comb jellies compose much of the ocean’s plankton

Answer 5

Ctenophora