The is a muscle in the bottom of the chest that bends downward to draw air in, and bows upward to force air out of the lungs. a. diaphram b. bronchi c. trachea d. heart

What must be done to breed dogs for a partical trait

8) animals respond in various ways to stimuli detected through their senses. some of these responses are stimulated by the presence of danger. which of these animal responses is the best example of a response to an immediate threat? a) a rooster crows every morning at the first sign of light. b) as something approaches an octopus, it shoots a cloud of ink. c) from late fall until spring, bears hibernate to preserve energy. d) a dog is getting hot in the sunlight, so he moves to a shaded area.

All eukaryotic cells contain small bodies called