Answer the following question given this paragraph: Using fossil fuels affects the environment in a variety of ways. There are impacts to the environment when we extract these resources. Burning these fuels causes air pollution. These fuels release carbon dioxide, which is a major factor in global warming ( Figure below ). Q: What gas is released by burning of fossil fuels and contributes to global warming? Choices: - nitrous oxide - hydrogen - helium - carbon dioxide A:
carbon dioxide
(Question)
Answer the following question given this paragraph: Homeostasis refers to the balance, or equilibrium, within the cell or a body. It is an organism's ability to keep a constant internal environment. Keeping a stable internal environment requires constant adjustments as conditions change inside and outside the cell. The adjusting of systems within a cell is called homeostatic regulation. Because the internal and external environments of a cell are constantly changing, adjustments must be made continuously to stay at or near the set point (the normal level or range). Homeostasis is a dynamic equilibrium rather than an unchanging state. The cellular processes discussed in both the Diffusion and Active Transport concepts all play an important role in homeostatic regulation. You will learn more about homeostasis in other concepts. Q: What term refers to the balance, or equilibrium, within the cell or a body, and an organism's ability to keep a constant internal environment? Choices: - metabolism - ketosis - consciousness - homeostasis A:
(Answer)
homeostasis
Ques: Answer the following question given this paragraph: the nucleus. The nucleus contains one or more nucleoli, which serve as sites for ribosome synthesis. The nucleus houses the genetic material of the cell: DNA. DNA is normally found as a loosely contained structure called chromatin within the nucleus, where it is wound up and associated with a variety of histone proteins. When a cell is about to divide, the chromatin coils tightly and condenses to form chromosomes. There is a pool of cells constantly dividing within your body. The result is billions of new cells being created each day. Before any cell is ready to divide, it must replicate its DNA so that each new daughter cell will receive an exact copy of the organism's genome. A variety of enzymes are enlisted during DNA replication. These enzymes unwind the DNA molecule, separate the two strands, and assist with the building of complementary strands along each parent strand. The original DNA strands serve as templates from which the nucleotide sequence of the new strands are determined and synthesized. When replication is completed, two identical DNA molecules exist. Each one contains one original strand and one newly synthesized complementary strand. Q: Dna is normally found within what region of a cell? Choices: - genome sequence - mitochondria - Golgi apparatus - nucleus A:
Ans: nucleus
(Q).
Answer the following question given this paragraph: Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out. Other examples of friction are illustrated in the two Figures below and below . You can see an animation showing how friction opposes motion at this URL:. Q: What force opposes a motion of a moving body? for example a car breaking on a road. Choices: - tension - vibration - thermal - friction A:
(A).
friction
Ques:Answer the following question given this paragraph: A compound has different properties than the substances it contains. For example, hydrogen and oxygen are gases at room temperature. But when they combine chemically, they form liquid water. Another example is table salt, or sodium chloride. It contains sodium and chlorine. Sodium is a silvery solid that reacts explosively with water, and chlorine is a poisonous gas (see Figure below ). But together, sodium and chlorine form a harmless, unreactive compound that you can safely sprinkle on food. Q: In what form of matter is hydrogen at room temperature? Choices: - dissolved - liquid - solid - gas A:

Ans:gas
Ques:Answer the following question given this paragraph: Each of the above organs of excretion is also part of another body system. For example, the large intestine and liver are part of the digestive system, and the lungs are part of the respiratory system. The kidneys are the main organs of excretion. They are part of the urinary system. Q: What paired organs that are part of the urinary system play the prime role in excretion? Choices: - ovaries - liver - lungs - kidneys A:

Ans:
kidneys