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Amphibians are likely to estivate during ___.
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
An organ consisting of embryonic and maternal tissues that nourishes a developing embryo inside the mother is called ___.
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
What distinguishes monotremes from other mammals?
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
What distinguishes placental mammals from other mammals?
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
Which of these is an amphibian?
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
Which of the following is NOT an adaptation that enables birds to fly?
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
Flight muscles attach to a bird's ___.
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
Which was the first group of vertebrates to live on land?
salamander
placenta
crop
keel
hot, dry weather
Their embryos completely develop inside the female's uterus.
They lay eggs with leathery shells.
amphibians
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