Q: Twin studies have been instrumental in demonstrating what type of component in autism? Choices: - internal - bacterial - natural - environmental A:
environmental

(Question)
Q: Van der waals forces are weak interactions between molecules that involve what? Choices: - atoms - particles - photons - dipoles A:
(Answer)
dipoles

Ques: Q: What do covalent bonds give atoms a more stable arrangement of? Choices: - protons - neutrons - cell walls - electrons A:
Ans: electrons

(Q).
Q: Ovulation is the release of an egg from the what? Choices: - fallopian tubes - cervix - vagina - ovary A:
(A).
ovary

Ques:Q: What describes the amount of solute in a solution? Choices: - viscosity - solubility - frequency - tonicity A:

Ans:tonicity

Q: What helps pumice float in water? Choices: - high density - large mass - gravity - gas bubble holes A:
gas bubble holes