Ques: Q: The existence of what tiny, fundamental particles of matter was first proposed in the 1960s? Choices: - atoms - molecules - neutrons - quarks A:
Ans: quarks

Ques: Q: Which theory describes the benzene molecule and other planar aromatic hydrocarbon molecules as hexagonal rings of sp2-hybridized carbon atoms with the unhybridized p orbital of each carbon atom perpendicular to the plane of the ring? Choices: - hybrid orbital theory - covalent bond theory - molecular orbital theory - valence bond theory A:
Ans: valence bond theory

Ques: Q: The fetus becoming relatively large and mature before birth increases the chances of what? Choices: - disease - mutations - intelligence - survival A:
Ans: survival

Ques: Q: Oxygen, carbon, hydrogen and what other element make up approximately 96% of living matter? Choices: - calcium - helium - silicon - nitrogen A:
Ans:
nitrogen