Single-celled consumers called _______ diversified rapidly during the Jurassic and Cretaceous.

The breakup of Pangaea began with ____.​

Match the category of drawing with the information it contains.

Neurons that carry touch, vibration and non-painful stimuli synapse on interneurons in the cord and reduce the signals from nociceptors (pain receptors) that reach the brain resulting in a decrease in pain.  This is called:

Consider solving

You step on a sharp tack and a reflex occurs which causes you to withdraw your foot from the tack and at the same time straighten your uninjured leg to support the transfer of weight.  What do we call this response?

 A person is confronted by a dangerous dog. His heart begins to race and beat strongly, his pupils dilate, and his hairs stand up. These signs are the result of:

What is the term for the build-up of toxins in tissues of animals, especially at higher trophic levels?

The origin of this muscle is the pubic crest and the __________ __________.

A sudden increase in blood pressure detected by _______________ in the walls of large arteries near the heart will cause ___________________________.