animals #2

Question 1

have a back bone

Answer 1

vertebrate

Question 2

used for flexibility and stability

Answer 2

notochord

Question 3

tail extends past the anus for the first time

Answer 3

postanal tail

Question 4

have notochord, but no skeleton

Answer 4

jawless fish

Question 4

nervous system that runs along the top of the body

Answer 4

dorsal nerve chord

Question 5

structures near the mouth

Answer 5

pharyngeal gill slits

Question 6

very thin, change direction while swimming

Answer 6

ray fin

Question 7

fish have a skeleton made of cartilage

Answer 7

cartilaginous fish

Question 8

latest evolved fish, skeleton made of bone

Answer 8

bony fish

Question 9

fleshy and thick, used like oars

Answer 9

lobed fin

Question 10

an animal with 4 limbs

Answer 10

tetrapod

Question 11

can regulate own body temperature, feathers, flight, lightweight skeleton

Answer 11

birds

Question 12

start life in water, breathe through skin or lungs

Answer 12

amphibians

Question 13

dependent of water to reproduce , waterproof skin

Answer 13

reptiles

Question 14

characterized by having fur, live birth offspring

Answer 14

mammals

Question 15

had traits of reptiles and mammals

Answer 15

early mammals

Question 16

egg laying mammals

Answer 16

monotremes

Question 17

young, attach to mother in a special pouch and grow longer

Answer 17

marsupial mammals

Question 18

young and born later, attach to mother inside the womb via the placenta

Answer 18

placental mammals

Question 19

evolution of mammals that live in water

Answer 19

evolved from land dwelling animals

Question 20

evolution of birds

Answer 20

evolved from reptiles

Question 21

what structure of fish is important to evolution into land

Answer 21

limbs in fish

Question 22

main consideration for animals that want to evolve from water into land

Answer 22

water