An egg with a hard outer casing and an inner series of membranes and fluids that form a padding around the growing embryo. The evolution of the amniotic egg, in reptiles, freed them from the constraint of having to reproduce near water.

A bodily symmetry in which opposites sides of a sagittal plane are mirror images of one another. Animals generally are generally are bilaterally symmetrical.

A form of asexual reproduction in which an offspring is produced as an outgrowth of an organism.

closed circulation system

A type of circulation, found in all vertebrates and in some invertebrates, in which circulatory fluid stays within vessels.

A central body cavity, found in most animals.

In animal sexual reproduction, the release of sperm within a female by a male reproductive organ.

An external material covering the animal body, providing support and protection.

An animal that possesses both male and female sex organs.

A skeleton in which the force of muscular contraction is applied through a fluid.

An animal without a vertebral column.

A periodic shedding of an old skeleton.

A highly organized unit within an organism, performing one or more functions, that is formed of several kinds of tissue. Kidneys, heart, lungs, and liver are all familiar examples of organs in humans.

open circulation system

A type of circulation, found in many invertebrate animals, in which circulatory fluid does not stay confined in vessels, but flows into open spaces, called sinuses, where it bathes tissues before being returned to vessels.

A condition, seen in all birds and many reptiles, in which fertilized eggs are laid outside the mother's body and then develop there.

A form of asexual reproduction in which an unfertilized egg develops into an adult organism.

A type of animal symmetry in which body parts are distributed evenly about a central axis. Sea Stars are radially symmetrical.

An equivalence of size, shape, and relative position of parts across a dividing line or around a central point.

An organized assemblage of similar cells that serves a common function. Nervous, epithelial and muscle tissue are some familiar examples.

A condition in animals in which fertilized eggs develop inside a mother's body.

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SS-Bio23 22

Question	Answer
amniotic egg	An egg with a hard outer casing and an inner series of membranes and fluids that form a padding around the growing embryo. The evolution of the amniotic egg, in reptiles, freed them from the constraint of having to reproduce near water.
bilateral symmetry	A bodily symmetry in which opposites sides of a sagittal plane are mirror images of one another. Animals generally are generally are bilaterally symmetrical.
budding	A form of asexual reproduction in which an offspring is produced as an outgrowth of an organism.
closed circulation system	A type of circulation, found in all vertebrates and in some invertebrates, in which circulatory fluid stays within vessels.
coelom	A central body cavity, found in most animals.
copulation	In animal sexual reproduction, the release of sperm within a female by a male reproductive organ.
exoskeleton	An external material covering the animal body, providing support and protection.
hermaphrodite	An animal that possesses both male and female sex organs.
hydrostatic skeleton	A skeleton in which the force of muscular contraction is applied through a fluid.
invertebrate	An animal without a vertebral column.
molting	A periodic shedding of an old skeleton.
organ	A highly organized unit within an organism, performing one or more functions, that is formed of several kinds of tissue. Kidneys, heart, lungs, and liver are all familiar examples of organs in humans.
open circulation system	A type of circulation, found in many invertebrate animals, in which circulatory fluid does not stay confined in vessels, but flows into open spaces, called sinuses, where it bathes tissues before being returned to vessels.
oviparous	A condition, seen in all birds and many reptiles, in which fertilized eggs are laid outside the mother's body and then develop there.
parthenogenesis	A form of asexual reproduction in which an unfertilized egg develops into an adult organism.
radial symmetry	A type of animal symmetry in which body parts are distributed evenly about a central axis. Sea Stars are radially symmetrical.
symmetry	An equivalence of size, shape, and relative position of parts across a dividing line or around a central point.
tissue	An organized assemblage of similar cells that serves a common function. Nervous, epithelial and muscle tissue are some familiar examples.
viviparous	A condition in animals in which fertilized eggs develop inside a mother's body.

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