Q: Ionic bonds between two atoms require one metal and one what? Choices: - liquid - gas - metallic - nonmetal A:
nonmetal

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

Ques: Q: What kinds of cells that are important to our physical functioning can atrophy when they are not used? Choices: - reproductive - brain - digestive - muscles A:
Ans: muscles

(Q).
Q: What is defined as male gametes that form in the testes and mature in the epididymis? Choices: - plasma - mucus - stereocilia - sperm A:
(A).
sperm

Ques:Q: What contracts to move food throughout the gastrointestinal tract? Choices: - fluids - nerves - vessels - muscles A:

Ans:muscles

Q: Most scientists think that ordinary matter makes up how much of the total matter in the universe? Choices: - greater than half - about half - more than half - less than half A:
less than half