exam 3 chapter 15

Question 1

____ million living species have been discovered

Answer 1

1.3

Question 2

animals are ______ that injest their food

Answer 2

heterotrophs

Question 3

animals are _____ eukaryotes

Answer 3

multicellular

Question 4

animal cells _____ cell walls

Answer 4

lack

Question 5

animals bodies are held together by structural proteins called

Answer 5

collagen

Question 6

____ tissue and _____ tissue are unique to animals

Answer 6

nervous, muscle

Question 7

most animals reproduce _____ with diploid state usually dominating the life cycle

Answer 7

sexually

Question 8

although the _____ family of genes has been highly conserved, its can produce a wide diversity of animal morphology

Answer 8

hox

Question 9

time period between 542–251 million years ago

Cambrian period that last 53 million years known as the Cambrian explosion

marked a dramatic burst of evolutionary changes and its cause is hypothesized in the evolving of predator-prey relationship and rise in atmospheric oxygen

Answer 9

Paleozoic era

Question 10

time period between 251-65.5 million years ago

dinosaurs were dominant terrestrial vertebrates

first mammals emerged

Answer 10

mesozoic era`

Question 11

time period between 65.5-present

followed mass extinctions of both terrestrial and marine animals including large nonflying dinosaurs and marine reptiles

Answer 11

Cenozoic era

Question 12

Cambrian explosion

Answer 12

marks the easiest fossil appearance pf many major groups of living animals

Question 13

body plan

Answer 13

a way zoologist categorize animals, a set of morphological and developmental traits, integrated into an animal

1. symmetry or lack of
2. tissues

Question 14

radial symmetry

Answer 14

can be split from the center

Question 15

bilateral symmetry

Answer 15

two-sided symmetry, split in half

Question 16

_______ are collections ofd specialized cells isolated from other tissue by membranous layer

Answer 16

tissues

Question 17

during development three ______ layers give rise to the tissues and organs of the animals embryo

Answer 17

germ

Question 18

ectoderm

Answer 18

germ layer covering the embryos surfaces

Question 19

endoderm

Answer 19

the innermost germ layer

Question 20

mesoderm

Answer 20

middle germ layer

Question 21

diploblastic animals

Answer 21

have ectoderm and endoderm

Question 22

triploblastic amimals

Answer 22

have an intervening third layer called mesoderm

Question 23

Germ layers

Answer 23

give rise to all of an animals tissue and organs through organogenesis