Answer the following question given this paragraph: Q: Which theory suggests plant species richness increases with island size? Choices: - island biology model - island symbolic model - island ecosystem model - island equilibrium model A:
island equilibrium model
(Question)
Answer the following question given this paragraph: There are many career options in physical science. Examples include pharmacist and surveyor. Q: Pharmacist and surveyor are two career options based in what type of science? Choices: - obvious - Business - visible - physical A:
(Answer)
physical
Ques: Answer the following question given this paragraph: When we run a reaction to produce a gas, we expect it to rise into the air. Many students have done experiments where gases such as hydrogen are formed. The gas can be trapped in a test tube held upside-down over the reaction. Carbon dioxide, on the other hand, sinks when it is released. Carbon dioxide has a density greater that air, so it will not rise like these other gases would. Q: Carbon dioxide does not rise like other gases because it has a density greater than what? Choices: - gravity - light - water - air A:
Ans: air
(Q).
Answer the following question given this paragraph: Despite its dangers, radioactivity has several uses. It can be used to determine the ages of ancient rocks and fossils. This use of radioactivity is explained in this chapter's "Radioactive Decay" lesson. Radioactivity can also be used as a source of power to generate electricity. This use of radioactivity is covered later on in this chapter in the lesson "Nuclear Energy. " Radioactivity can even be used to diagnose and treat diseases, including cancer. Cancer cells grow rapidly and take up a lot of glucose for energy. Glucose containing radioactive elements can be given to patients. Cancer cells will take up more of the glucose than normal cells do and give off radiation. The radiation can be detected with special machines (see Figure below ). Radioactive elements taken up by cancer cells may also be used to kill the cells and treat the disease. You can learn more about medical uses of radiation at the URL below. Q: What type of disease can be treated by radioactive elements in glucose? Choices: - mutation - infection - genetic disorder - cancer A:
(A).
cancer
Ques:Answer the following question given this paragraph: Evolution happens because of natural selection . Good traits become more common in a population. Bad traits become less common. The deer mouse, species Peromyscus maniculatus gives an example of evolution by natural selection. In Nebraska, this mouse is typically brown. But in places where glaciers dropped lighter sand over the darker soil, the mice are light. Why? Because predators could more easily spot the dark mice on light sand. The lighter mice were more likely to survive and have offspring. Natural selection favored the light mice. Over time, the population became light colored. Enough changes may take place over time that the two types of mice become different species. Q: Evolution happens because of what? Choices: - natural resources - natural change - natural process - natural selection A:

Ans:natural selection
Ques:Answer the following question given this paragraph: An aldehyde is a carbonyl in which the carbon atom is bonded to one carbon atom and one hydrogen atom (or two hydrogen atoms, see below). Because the hydrogen atom is so small, the partial positive charge on the carbonyl carbon is very easy for other molecules to approach, making aldehydes a particularly reactive type of carbonyl. Aldehydes are versatile reactants for a wide variety of organic syntheses. Many aldehydes also have distinctive flavors and aromas. For example, the flavor of cinnamon is primarily due to the molecule cinnamaldehyde, and vanillin is the aldehyde most responsible for the smell and taste of vanilla extract. Q: Name a carbonyl in which the carbon atom is bonded to one carbon atom and one hydrogen atom (or two hydrogen atoms). Choices: - ketone - acetylcholine - ester - aldehyde A:

Ans:
aldehyde