Vertebrates

Question 1

Vertebrates

Answer 1

chordates with a backbone and encased brain/skull, contains seven classes

Question 2

Agnatha

Answer 2

jawless fish, lampreys

Question 3

Chondrichthyes

Answer 3

cartilaginous fish, sharks, rays

Question 4

Osteichthyes

Answer 4

bony fish, most numerous and diverse of the vertebrates

Question 5

Amphibia

Answer 5

amphibians, arose from fish

Question 6

Reptilia

Answer 6

arose from amphibians, first to not be dependent of standing water, cerebral cortex began to enlarge

Question 7

Aves

Answer 7

birds, arose from dinosaurs, only vertebrates with feathers

Question 8

Mammalia

Answer 8

evolved from reptiles, vertebrates with hair and mammary glands

Question 9

Therapsids

Answer 9

reptiles that mammals evolved from approximately 225 mya

Question 10

Asteroid

Answer 10

crashed into earth around 65mya, size of Mt, Everest (9 miles wide), impact probably caused global broiling, atmospheric debris may have blocked sunlight for months, cooling the earth, all land animals bigger than dogs became extinct, mammal species exploded to take over the niches from the extinct dinosaurs

Question 11

First to come into abundance after the asteroid

Answer 11

ferns because they prefer shade

Question 12

Monotremes

Answer 12

egg laying mammals

Question 13

Marsupials

Answer 13

mammals with a pouch

Question 14

Placental

Answer 14

mammals where embryonic development occurs in the uterus

Question 15

New trait found in mammals following extinction of dinosaurs

Answer 15

extended period of care and training of offspring to allow for flexible behavior to be learned that is appropriate to changing environment