Answer the following question given this paragraph: Enthalpy changes also occur when a solute undergoes the physical process of dissolving into a solvent. Hot packs and cold packs (see Figure below ) use this property. Many hot packs use calcium chloride, which releases heat when it dissolves according to the equation below. Q: When a solute dissolves into a solvent what is that called? Choices: - solubility - viscosity - mixing - enthalpy A:
enthalpy
(Question)
Answer the following question given this paragraph: A change in the sequence of bases in DNA or RNA is called a mutation . Does the word mutation make you think of science fiction and bug-eyed monsters? Think again. Everyone has mutations. In fact, most people have dozens or even hundreds of mutations in their DNA. Mutations are essential for evolution to occur. They are the ultimate source of all new genetic material - new alleles - in a species. Although most mutations have no effect on the organisms in which they occur, some mutations are beneficial. Even harmful mutations rarely cause drastic changes in organisms. Q: What is a change in the sequence of bases in dna or rna called? Choices: - radiation - infection - evolution - mutation A:
(Answer)
mutation
Ques: Answer the following question given this paragraph: Radioactivity was discovered in 1896 by a French physicist named Antoine Henri Becquerel. Becquerel was experimenting with uranium, which glows after being exposed to sunlight. Becquerel wanted to see if the glow was caused by rays of energy, like rays of light and X-rays. He placed a bit of uranium on a photographic plate. The plate was similar to film that's used today to take X-rays. You can see an example of an X-ray in Figure below . As Becquerel predicted, the uranium left an image on the photographic plate. This meant that uranium gives off rays after being exposed to sunlight. Q: Name the physicist who discovered radioactivity? Choices: - louis pasteur - neal degrasse tyson - albert einstein - antoine henri becquerel A:
Ans: antoine henri becquerel
(Q).
Answer the following question given this paragraph: Because chemical changes result in different substances, they often cannot be undone. Some chemical changes can be reversed, but only by other chemical changes. Q: By what kind of change can a chemical change be reversed? Choices: - another carbon change - another thermal change - another radioactive change - another chemical change A:
(A).
another chemical change
Ques:Answer the following question given this paragraph: Natural selection occurs when there are differences in fitness among members of a population. Q: Differences in fitness among different members of a population can lead to what kind of selection? Choices: - fluid selection - subliminal selection - origin selection - natural selection A:

Ans:natural selection
Ques:Answer the following question given this paragraph: Mechanical digestion occurs when large chunks of food are broken down into smaller pieces. This is a physical process that happens mainly in the mouth and stomach. Q: What physical process occurs when large chunks of food are broken down into smaller pieces? Choices: - chemical digestion - swallowing - peristalsis - mechanical digestion A:

Ans:
mechanical digestion