Answer the following question given this paragraph: The water supply can be harmed in two major ways. The water can be polluted, and it can be overused. Protecting the water supply must address both problems. We need to reduce how much pollution ends up in the water supplykeeping water from being polluted is easier and cheaper than cleaning it. We need to treat water that's already polluted. We need to conserve water by using less. Q: What's the best way humans can conserve water? Choices: - boil it - use more - salt it - use less A:
use less
(Question)
Answer the following question given this paragraph: In the course of a chemical reaction between a metal and a nonmetal, electrons are transferred from the metal atoms to the nonmetal atoms. For example, when zinc metal is mixed with sulfur and heated, the compound zinc sulfide is produced. Two valence electrons from each zinc atom are transferred to each sulfur atom. 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: Answer the following question given this paragraph: Simple diffusion occurs when a substance diffuses through a cell membrane without any help from other molecules. The substance simply passes through tiny spaces in the membrane. It moves from the side of the membrane where it is more concentrated to the side where it is less concentrated. You can see how this happens in Figure below . 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).
Answer the following question given this paragraph: During sexual reproduction, two haploid gametes join in the process of fertilization to produce a diploid zygote. 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:Answer the following question given this paragraph: Water as a Component of Liquid Mixtures A mixture is a combination of two or more substances, each of which maintains its own chemical identity. In other words, the constituent substances are not chemically bonded into a new, larger chemical compound. The concept is easy to imagine if you think of powdery substances such as flour and sugar; when you stir them together in a bowl, they obviously do not bond to form a new compound. The room air you breathe is a gaseous mixture, containing three discrete elementsnitrogen, oxygen, and argonand one compound, carbon dioxide. There are three types of liquid mixtures, all of which contain water as a key component. These are solutions, colloids, and suspensions. 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:Answer the following question given this paragraph: Figure 22.24 The Van Allen radiation belts are two regions in which energetic charged particles are trapped in the Earth's magnetic field. One belt lies about 300 km above the Earth's surface, the other about 16,000 km. Charged particles in these belts migrate along magnetic field lines and are partially reflected away from the poles by the stronger fields there. The charged particles that enter the atmosphere are replenished by the Sun and sources in deep outer space. 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