Rise of Animal Diversity

Question 1

What were the 1st macroscopic fossils?

Answer 1

ediacaran biota

Question 2

What phylum do sponges belong to?

Answer 2

Porifera

Question 3

capture food particles in the water that passes through their body

Answer 3

filter feeders

Question 4

groups of cells that function as a unit

Answer 4

true tissues

Question 5

What do sponges lack?

Answer 5

true tissues

Question 6

sac with a central digestive compartment

Answer 6

gastrovascular cavity

Question 7

How do cnidarians capture prey?

Answer 7

tentacles

Question 8

What phylum are jellyfish and sea anemone in?

Answer 8

Cnidaria

Question 9

How is the nerve net distributed in the body of cnidarians?

Answer 9

throughout the whole body

Question 10

have a complete digestive track and a bilaterally symmetric form

Answer 10

bilaterians

Question 11

When did the Cambrian explosion occur?

Answer 11

535 to 525 million years ago

Question 12

set of morphological and developmental traits

Answer 12

body plan

Question 13

What are the 3 important aspects of body plans?

Answer 13

• symmetry
• tissues
• body cavity

Question 14

no front or back or left or right

Answer 14

radial symmetry

Question 15

dorsal, ventral, left and right

Answer 15

bilateral symmetry

Question 16

What are the 3 germ layers?

Answer 16

ectoderm, endoderm, mesoderm

Question 17

covers the embryo’s surface

Answer 17

ectoderm

Question 18

lines the developing digestive tube

Answer 18

endoderm

Question 19

digestive tube in the endoderm

Answer 19

arnchenteron

Question 20

fills the space between the ectoderm and endoderm

Answer 20

mesoderm

Question 21

fluid or air filled space between the digestive tract and the outer body wall

Answer 21

body cavities

Question 22

What functions can the body cavity perform?

Answer 22

• cushion suspended organs
• act as a hydrostatic skeleton
• enables internal organs to move independently

Question 23

Animals are ____phyletic.

Answer 23

monophyletic

Question 24

Sponges are ____.

Answer 24

basal

Question 25

______ have true tissues.

Answer 25

Eumetazoans

Question 26

Most animal phyla are ______ and _____; except phylum ______.

Answer 26

bilaterians; invertebrates; Chordata