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A group of warm-blooded egg-laying vertebrates, with characteristics that include feathers, beaks, and usually flight. They are the only known living dinosaurs. 

Passage of the fetus from the uterus to the outside world; the act of being born.

A primitive part of the brain that connects the brain to the spinal cord, the brain stem controls functions basic to survival, such as heart rate, breathing, digestive processes, and sleeping.

Earlier or sooner than.

A spongy tissue found in the center of some bones.

Irregular contractions of the uterine muscle, often called false labour.

The outer layer of the cerebrum. Sometimes referred to as the cerebral cortex.

In or toward a lower place; lower in quantity or number.

A spongy tissue found in the center of some bones.

The collapsed core of a massive star. Stars that are very massive will collapse under their own gravity when their fuel is exhausted. The gravitational pull is so strong that not even light can escape.