Ques: Q: What process converts the sun's hydrogen nuclei into helium? Read this paragraph and choose the correct option from the provided answers: Figure 32.19 Nuclear fusion in the Sun converts hydrogen nuclei into helium; fusion occurs primarily at the boundary of the helium core, where temperature is highest and sufficient hydrogen remains. Energy released diffuses slowly to the surface, with the exception of neutrinos, which escape immediately. Energy production remains stable because of negative feedback effects. Choices: - solar fission - nuclear fission - combustion - nuclear fusion A:
Ans: nuclear fusion

Ques: Q: In most animals, the circulatory system is used to transport blood through the what? Read this paragraph and choose the correct option from the provided answers: CHAPTER SUMMARY 40.1 Overview of the Circulatory System In most animals, the circulatory system is used to transport blood through the body. Some primitive animals use diffusion for the exchange of water, nutrients, and gases. However, complex organisms use the circulatory system to carry gases, nutrients, and waste through the body. Circulatory systems may be open (mixed with the interstitial fluid) or closed (separated from the interstitial fluid). Closed circulatory systems are a characteristic of vertebrates; however, there are significant differences in the structure of the heart and the circulation of blood between the different vertebrate groups due to adaptions during evolution and associated differences in anatomy. Fish have a two-chambered heart with unidirectional circulation. Amphibians have a three-chambered heart, which has some mixing of the blood, and they have double circulation. Most non-avian reptiles have a three-chambered heart, but have little mixing of the blood; they have double circulation. Mammals and birds have a four-chambered heart with no mixing of the blood and double circulation. Choices: - fur - stratum corneum - nerves - body A:
Ans: body

Ques: Q: Chemical equations need to be balanced to satisfy the law of what? Read this paragraph and choose the correct option from the provided answers: Chemical equations need to be balanced to satisfy the law of conservation of matter. Choices: - material of matter - glow of matter - speed of matter - conservation of matter A:
Ans: conservation of matter

Ques: Q: Which has more electrons, neon or fluorine? Read this paragraph and choose the correct option from the provided answers: Although neon has just one more electron than fluorine in its outer energy level, that one electron makes a huge difference. Fluorine needs one more electron to fill its outer energy level in order to have the most stable arrangement of electrons. Therefore, fluorine readily accepts an electron from any element that is equally "eager" to give one up, such as the metal lithium or sodium. As a result, fluorine is highly reactive. In fact, reactions with fluorine are often explosive, as you can see in the URL below. Neon, on the other hand, already has a full outer energy level. It is already very stable and never reacts with other elements. It neither accepts nor gives up electrons. Neon doesn't even react with fluorine, which reacts with all other elements except helium. Choices: - the same - fluorine - neither - neon A:
Ans:
neon