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:
notochord

Q: What the scientific concept stating that when looking at two competing theories, the one with fewer assumptions should be chosen? Choices: - law of thermodynamics - law of simplicity - law of averages - law of parsimony A:
law of parsimony

Q: Q: What are the cells that break down inorganic molecules to supply energy for the cell, and use carbon dioxide as a carbon source? Choices: - staurikosaurus - fluctuations - Sediments - chemoautotrophs A:
A: chemoautotrophs

Question: Q: What is the metabolic process by which cells obtain energy by "burning" glucose? Choices: - electromagnetic respiration - cellular transportation - cellular digestion - cellular respiration A:
Answer: cellular respiration

*Question*
Q: Upwelling mantle at the mid-ocean ridge pushes plates in which direction? Choices: - eastward - inward - westward - outward A:
**Answer**
outward

Q: Q: Connective tissues typically have three characteristic components in common: cells, large amounts of amorphous ground substance, and what else? Choices: - antioxidants - hormones - white blood cells - protein fibers A:
A: protein fibers