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