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During pregnancy and before birth.

Average (Mean)

In ecology, biotic factors are the living part of an ecosystem.

Pain in the lower back that begins during labor; thought to be caused by the baby’s position within the pelvis, where their head presses against your spine and tailbone.

Earlier or sooner than.

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

The baby's back is in the same orientation as the mother's back, making it a difficult birth.

A mass or growth of abnormal cells found in the brain. While people may commonly equate brain tumors with cancer, many tumors are benign—but their location in the brain can still interfere with normal brain function.

Earlier or sooner than.

A severe snowstorm with high winds.