Question

Fill in the blank:
1. One of the differences between Cambrian animals and pre-Cambrian animals was the appearance of __________, such as antennae, as Cambrian animals evolved.
2. Although they are radically symmetrical, echinoderms are more closely related to a human than to a jellyfish because they are __________.
3. The ancient chordates are thought to be most closely related to echinoderms because the embryos of chordates and echinoderms are __________.
4. Leeches are classified as __________, because they obtain food by feeding on the blood of animals to which they are attached.

Answer 1

5. If a dog learns to ignore vehicles that drive past its house without stopping, the dog's behavior has probably been altered through the type of learning known as __________.

Answer 2

1. segmental sclerotizations

Answer 3

2. deuterostomes

Answer 4

Thanks!!! 3 4 5? @LaShaun97

Answer 5

im trying to figure those out now...hold on

Answer 6

5. Classical Conditioning

Answer 7

IDK....3 & 4

Answer 8

Do you think that three might be deuterosome too?

Answer 9

And the only thing I can think of for four is parasite. Do you think that is right?

Answer 10

@LaShaun97

Answer 11

ummmm maybe.....yea tht sounds right

Answer 12

Okay, thanks!