animal diversity

Question 1

history

Answer 1

• common ancestor 675-875 million years ago

- protists are closest relatives to animals

Question 2

Palezoic Era

Answer 2

542-251 million years ago

• cambrian explosion
• new predator and prey relationships, rise in oxygen and hox gene complex

Question 3

Mesozoic Era

Answer 3

251-65.5 million years ago

• coral reefs emerged becoming niches
• first mammals

Question 4

cenozoic era

Answer 4

65.5-present
followed mass extinction to both terrestrial and marine animals
modern mammals

Question 5

animals

Answer 5

-tissue from embryonic layers

Question 6

nutritional mode

Answer 6

• heterotrph and ingest food
• cannot construct organic molecules
• use enzymes to ingest food

Question 7

cell structure and specialization

Answer 7

multicellular
lack cell wall
nervous tissue

Question 8

reproduction and development

Answer 8

reproduce sexually- diploid stage dominating life cycle
-fertilization-> cleavage-> bastula
bastula undergoes gastrulation forming embryonic tissue

Question 9

development

Answer 9

hox gene

Question 10

body plan

Answer 10

bilateral (more complex)

radial

Question 11

tissue

Answer 11

ectoderm-innermost
endoderm-outermost
dipoblastic
triploblastic-include mesoderm

Question 12

body cavity

Answer 12

coelom

Question 13

protostome and deuterostome

Answer 13

protosome- spiral and determinate

dueterostome-radial and indeterminate