Q: What type of organism was the only able to live in the anoxic atmosphere of the first 2 billion years? Choices: - aerobic - protists - mammals - anaerobic A:
anaerobic

Q: Low levels of thyroid hormones in the blood cause the release of what by the hypothalamus and pituitary gland? Choices: - acids - bases - enzymes - hormones A:
hormones

Q: Q: A pedigree is a chart which shows the inheritance of a trait over several what? Choices: - centuries - events - organisms - generations A:
A: generations

Question: Q: What kind of reactions absorb energy from their surroundings as they occur? Choices: - exothermic - hydrostatic - autotrophic - endothermic A:
Answer: endothermic

*Question*
Q: Each antibody can bind with just one specific type of what, resulting in a signal for a phagocyte to destroy them? Choices: - pathogen - adhesion - immunogen - antigen A:
**Answer**
antigen

Q: Q: Other than nitrogen, which nutrient most often limits marine production? Choices: - potassium - zinc - calcium - phosphorus A:
A: phosphorus