Q: How many mass distinctions have radically altered the history of life? Choices: - six - one - four - five A:
five

Q: The density of bone is, in part, related to the amount of what mineral in one's diet? Choices: - potassium - barium - nitrogen - calcium A:
calcium

Q: Q: What are the secretions released by the endocrine glands called? Choices: - acids - fluids - enzymes - hormones A:
A: hormones

Question: Q: What type of device do scientist use to determine wind speed? Choices: - barometer - photometer - dynamometer - anemometer A:
Answer: anemometer

*Question*
Q: Parasitic leeches feed off of what? Choices: - brain - tissue - tumor - blood A:
**Answer**
blood

(Q).
Q: What is the term for organisms that live in extremely hot environments? Choices: - hydrophylic - thermophobes - exothermic - thermophiles A:
(A).
thermophiles