Answer the following question given this paragraph: Carbon-14 has a relatively short half-life. It decays quickly compared to some other unstable isotopes. So carbon-14 dating is useful for specimens younger than 50,000 years old. That's a blink of an eye in geologic time. But radiocarbon dating is very useful for more recent events. One important use of radiocarbon is early human sites. Carbon-14 dating is also limited to the remains of once-living things. To date rocks, scientists use other radioactive isotopes. Q: What property of carbon and other elements can be used to date fossils and rocks, among other things? Choices: - mass - full-life - magnetic force - half-life A:
half-life
(Question)
Answer the following question given this paragraph: Rising and sinking air can influence the precipitation of a region. Q: What does rising and sinking air influence in a region? Choices: - temperature - erosion - tides - precipitation A:
(Answer)
precipitation
Ques: Answer the following question given this paragraph: Figure 4.17 The chloroplast has an outer membrane, an inner membrane, and membrane structures called thylakoids that are stacked into grana. The space inside the thylakoid membranes is called the thylakoid space. The light harvesting reactions take place in the thylakoid membranes, and the synthesis of sugar takes place in the fluid inside the inner membrane, which is called the stroma. Chloroplasts also have their own genome, which is contained on a single circular chromosome. Q: Within the chloroplast, synthesis of what takes place in the fluid inside the inner membrane called the stroma? Choices: - fructose - wheat - glucose - sugar A:
Ans: sugar
(Q).
Answer the following question given this paragraph: Hydroxides Hydroxides are compounds that contain the OH ion. It is possible to prepare these compounds by two general types of reactions. Soluble metal hydroxides can be produced by the reaction of the metal or metal oxide with water. Q: What is produced by the reaction of metal oxide with water? Choices: - heat energy - rust - hydrogen gas - soluble metal hydroxides A:
(A).
soluble metal hydroxides
Ques:Answer the following question given this paragraph: Traditionally, mammals were divided into groups based on their characteristics. Scientists took into consideration their anatomy (body structure), their habitats, and their feeding habits. Mammals are divided into three subclasses and about 26 orders. Some of the groups of mammals include:. Q: Traditionally, mammals were divided into groups based on what? Choices: - their sizes - their colors - their behaviors - their characteristics A:

Ans:their characteristics
Answer the following question given this paragraph: Physical properties describe the existence of matter, and chemical properties describe how substances change into other substances. Q: What properties describe the existence of matter, as opposed to chemical properties that describe how substances change into other substances? Choices: - gravitational - astronomical - biological - physical A:
physical