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How do snakes subdue their prey?
some by constriction, some by injecting venom, grabbing and swallowing whole
In the roof of a snake's mouth, a pitlike sense organ that picks up airborne chemicals is the _____.
A snake that kills by wrapping around its prey until it cannot breathe is called a _____.
How does A contrast between the salamander and the crocodile shown in Figure 31-2?
crocodile skin is dry and scaly while salamander skin is moist and smooth
How does B contrast between the salamander and the crocodile shown in Figure 31-2?
the crocodile's legs keep its body close to the ground?
How does C contrast between the salamander and the crocodile shown in Figure 31-2?
the crocodile has four chambers?
How does D contrast between the salamander and the crocodile shown in Figure 31-2?
crocodiles have stronger jaws
The ____________________ of a bird, which looks like a blade-shaped anchor, is a large breastbone to which powerful flight muscles are attached.
A(n) ____________________ is a lightweight, modified scale that provides insulation and enables flight.
When a snake or lizard's tongue is drawn back into the mouth, it is inserted into a structure called ____________________ where the chemical molecules are analyzed.
A(n) ____________________ is an animal that maintains a constant body temperature that is not dependent on the environmental temperature.
A(n) ____________________ contains membranes that protect the embryo and provide it with nourishment while it develops in a terrestrial environment.
clear part of the egg
embryo excretes nitrogenous wastes into it
outer membrane surrounding the yolk, allantois, and amnion that allows for gas exchange
membrane filled with fluid that cushions the embryo
main food supply for the embryo
Figure 31-1 shows a diagram of the amniotic egg, with its parts labeled A through F. Match each of the following terms with the labels: yolk, shell, chorion, amnion, allantois, albumen.
1. = D, albumen
2. = E, allantois
3. = C, amnion
4. = B, chorion
5. = F, shell
6. = A, yolk
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