Q: Q: What were the first vertebrates to evolve? Choices: - snail - trees - shark - fish A:
A: fish

Q: Q: A lens of what shape causes rays of light to diverge, or spread apart, as they pass through it? Choices: - convex - flat - elongated - concave A:
A: concave

Q: Q: What term describes a disease in which the immune system attacks the body's own cells? Choices: - contagious - inflammatory - acute - autoimmune A:
A: autoimmune

Q: Q: A major step in animal evolution was the evolution of what rigid rod that runs the length of the body? Choices: - limbic system - endoderm - mitochondria - notochord A:
A: notochord