During incomplete metamorphosis, an insect goes directly from an egg to a ______, which looks like a young adult insect without wings.
Animals that strain their food from the water are called ____ feeders.
Shark and some other fishes have endoskeletons made of ______, a tissue that is more flexible than bone.
A ______ system transports needed materials to cells and takes away waste.
A form of a cnidarian that looks like an upright vase is a _____.
The length of time between fertilization and birth is called the _____ period.
A hawk's long broad feathers provide _____, enabling it to fly very high or soar.
To grow, arthropods must shed their exoskeletons periodically and produce new ones in a process called _____.
A ____ is an immature form of an animal that looks different from the parent.
Animals that eat only other animals are ______.
Some animals go through a period of major body changes called ____.
In ______ reproduction, one parent produces a new organism identical to itself.
The eggs of land vertebrates, such as reptiles and birds are called ______ eggs.
A signal that causes an animal to react in some way is a ______.
A ______ is an animals reactions to a stimulus.
Most air breathing animals have _____, sac like structures made of a thin layer of cells where gases are exchanged.
In a _____ circulatory system, blood always stays inside vessels and the heart.
Materials are exchanged between the embryo and the mother through an organ called the _______.
A _____ is an organized grouping of neurons in the head of an animal with bilateral symmetry.
____ are nerve cell with a unique structure for receiving and passing on information.
A _____ is a place where two or more parts of a skeleton meet.
______ neurons are nerve cells that carry response information to muscles and other organs.
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