Question

1- The jaws of vertebrates are thought to have been derived by the modification of which of the structures from jawless fishes?
	A scales B the notochord C bones in the skull D the vertebrae E cartilage that supported the gills

2- The most reliable food source containing all of the essential amino acids for humans is:
	A beans. B sunflower seeds. C flavored corn chips. D corn. E meat.

3- What is the function of the bicarbonate ions secreted by the pancreas?
	A to neutralize acid produced by the stomach B to stimulate the release of bile from the gall bladder C to facilitate the transport of nutrients across the intestinal wall D to stimulate secretion of the hormone secretin E All of these choices are correct.

Answer 1

1. cartilage that supported the gills

2. meat

3. All of these choices are correct.