86. Chordates: CrashCourse Biology #24 Question Preview (ID: 50631)


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Phylum chordata accounts for 52,000__________of vertebrates and some invertebrates on earth.
a) colonies
b) members
c) mammals
d) species

Through evolution, the first “bones” arrived when __________came to be.
a) sharks
b) tadpoles
c) fish
d) frogs

With the evolution of Tetrapods, fins were replaced with limbs and a whole new body was formed.
a) True
b) False
c)
d)

The first tetrapods were_______________.
a) humans
b) dogs
c) reptiles
d) frogs

Frogs were the first species to develop a __________chambered heart.
a) 2
b) 3
c) 4
d) 6

The amniotic egg made it possible for life exclusively on land. The egg is encased in a ________________.
a) hard shell
b) soft shell
c) slimy shell
d) Floating shell

This new group living exclusively on land includes reptiles, birds, frogs and mammals.
a) True
b) False
c)
d)

Reptiles live only on land.
a) True
b) False
c)
d)

Reptiles are cold-blooded, meaning they get their heat from___________.
a) each other
b) rocks
c) the sun
d) the moon

Birds are endotherms, meaning they __________their own heat.
a) make
b) absorb
c)
d)

Birds are the first species with a four chambered heart.
a) True
b) False
c)
d)

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