Q: What's the best way humans can conserve water? Choices: - boil it - use more - salt it - use less A:
use less

(Question)
Q: When zinc metal is mixed with sulfur and heated, what is produced? Choices: - extraction sulfide - methane sulfide - iron - zinc sulfide A:
(Answer)
zinc sulfide

Ques: Q: What occurs when a substance diffuses through a cell membrane without any help from other molecules? Choices: - simple filtration - visible diffusion - visual diffusion - simple diffusion A:
Ans: simple diffusion

(Q).
Q: During what type of reproduction do two haploid gametes join in the process of fertilization to produce a diploid zygote? Choices: - asexual reproduction - essential reproduction - internal reproduction - sexual reproduction A:
(A).
sexual reproduction

Ques:Q: What describes a combination of two or more substances, each of which maintains its own chemical identity? Choices: - bond - structure - solute - mixture A:

Ans:mixture

Ques:Q: The van allen radiation belts are two regions in which energetic charged particles are trapped in earth's what? Choices: - gravitational field - cloud cover - ionosphere - magnetic field A:

Ans:
magnetic field