Answer the following question given this paragraph: Ecosystems need a constant input of energy to supply the needs of their organisms. Most ecosystems get energy from sunlight. A few ecosystems get energy from chemical compounds. Q: Where do most ecosystems get energy from? Choices: - precipitation - forests - oceans - sunlight A:
sunlight
Answer the following question given this paragraph: Q: What basic plant structure is the site of photosynthesis? Choices: - nucleus - spores - roots - leaves A:
leaves
Q: Answer the following question given this paragraph: Population growth is determined by rates of birth, death, immigration, and emigration. Q: Population growth is determined by rates of birth, death, immigration, and what else? Choices: - excitation - relaxation - exploitation - emigration A:
A: emigration
Question: Answer the following question given this paragraph: Because of human activities, there is more carbon dioxide in the atmosphere today than in the past hundreds of thousands of years. Burning fossil fuels and has released great quantities of carbon dioxide into the atmosphere. Cutting forests and clearing land has also increased carbon dioxide into the atmosphere because these activities reduce the number of autotrophic organisms that use up carbon dioxide in photosynthesis. In addition, clearing often involves burning, which releases carbon dioxide that was previously stored in autotrophs. Q: Cutting forests and clearing land has also increased the amount of what in the atmosphere? Choices: - oxygen - smog - pesticides - carbon dioxide A:
Answer: carbon dioxide
*Question*
Answer the following question given this paragraph: When HCl is dissolved into water, it is called hydrochloric acid. Ionic compounds and some polar compounds are completely broken apart into ions and thus conduct a current very well. A strong electrolyte is a solution in which a large fraction of the dissolved solute exists as ions. Q: Hydrochloric acid is formed when hcl is dissolved into what? Choices: - blood - sodium - plasma - water A:
**Answer**
water
(Question)
Answer the following question given this paragraph: Crystalline solids are generally classified according the nature of the forces that hold its particles together. These forces are primarily responsible for the physical properties exhibited by the bulk solids. The following sections provide descriptions of the major types of crystalline solids: ionic, metallic, covalent network, and molecular. Q: What kind of solids are generally classified by the forces that hold their particles together and include ionic, metallic, covalent network, and molecular types? Choices: - distinct solids - helium solids - flat solids - crystalline solids A:
(Answer)
crystalline solids