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Most fish and other animals that lay their eggs in water have
backbone
1
external fertilization
hair
fertilization
1
frog
fish
How many chambers do mammal hearts have?
backbone
1
external fertilization
hair
fertilization
1
frog
fish
Which animal has a 2 chambered heart?
backbone
1
external fertilization
hair
fertilization
1
frog
fish
Birds have all except
backbone
1
external fertilization
hair
fertilization
1
frog
fish
There are ______ classes of vertebrates
backbone
1
external fertilization
hair
fertilization
1
frog
fish
The union of an egg and sperm is called
backbone
1
external fertilization
hair
fertilization
1
frog
fish
Invertebrates have no
backbone
1
external fertilization
hair
fertilization
1
frog
fish
Which is an amphibian?
backbone
1
external fertilization
hair
fertilization
1
frog
fish
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