Q: The lighter photic zone and darker aphotic zone are determined by what? Read this paragraph and choose the correct option from the provided answers: Two main zones based on depth of water are the photic zone and aphotic zone. The photic zone is the top 200 meters of water. The aphotic zone is water deeper than 200 meters. The deeper you go, the darker the water gets. That's because sunlight cannot penetrate very far under water. Sunlight is needed for photosynthesis. So the depth of water determines whether photosynthesis is possible. There is enough sunlight for photosynthesis only in the photic zone. Choices: - water reflection - water shape - water density - water depth A:
water depth

Q: What type of behavior is frogs croaking or deer clashing antlers an example of? Read this paragraph and choose the correct option from the provided answers: Courtship behaviors occur in many other species. For example, males in some species of whales have special mating songs to attract females as mates. Frogs croak for the same reason. Male deer clash antlers to court females. Male jumping spiders jump from side to side to attract mates. Choices: - instincts - learned behavior - mating - courtship A:
courtship

Q: Q: The main components of the circulatory system are the heart, blood vessels, and what else? Read this paragraph and choose the correct option from the provided answers: The circulatory system can be compared to a system of interconnected, one-way roads that range from superhighways to back alleys. Like a network of roads, the job of the circulatory system is to allow the transport of materials from one place to another. As described in Figure below , the materials carried by the circulatory system include hormones, oxygen, cellular wastes, and nutrients from digested food. Transport of all these materials is necessary to maintain homeostasis of the body. The main components of the circulatory system are the heart, blood vessels, and blood. Choices: - lungs - nerves - brain - blood A:
A: blood

Question: Q: What is the ability of an atom to emit, or give off, charged particles and energy from the nucleus? Read this paragraph and choose the correct option from the provided answers: Radioactivity is the ability of an atom to emit, or give off, charged particles and energy from the nucleus. The charged particles and energy are called by the general term radiation . Only unstable nuclei emit radiation. When they do, they gain or lose protons. Then the atoms become different elements. (Be careful not to confuse this radiation with electromagnetic radiation, which has to do with the light given off by atoms as they absorb and then emit energy. ). Choices: - magnetism - electrolysis - electromagnetism - radioactivity A:
Answer: radioactivity

*Question*
Q: A minority of people on earth use up most of the planet's what, including energy? Read this paragraph and choose the correct option from the provided answers: Of course not. A minority of people use most of the world's energy and other resources. Not only are their needs met, but they have many luxuries. Many other people lack resources. Many don't have enough to eat or live, with the threat of hunger. Many also do not have safe, clean water. Some people live in crowded, run-down housing. Some people live in mansions. Choices: - air - sand - water - resources A:
**Answer**
resources

(Question)
Q: Telescopes use which kind of lenses to enlarge images? Read this paragraph and choose the correct option from the provided answers: Like microscopes, telescopes use convex lenses to make enlarged images. However, telescopes make enlarged images of objectssuch as distant starsthat only appear tiny because they are very far away. There are two basic types of telescopes: reflecting telescopes and refracting telescopes. The two types are compared in the Figure below . They differ in how they collect light, but both use convex lenses to form enlarged images. You can learn more about telescopes and how they evolved in the video at this URL:. Choices: - crystalline - spherical - concave - convex A:
(Answer)
convex