Answer the following question given this paragraph: A combustion reaction is a reaction in which a substance reacts with oxygen gas, releasing energy in the form of light and heat. Combustion reactions must involve O 2 as one reactant. The combustion of hydrogen gas produces water vapor. Q: What chemical element is required for a combustion reaction ? Choices: - carbon - helium - nitrogen - oxygen A:
oxygen
(Question)
Answer the following question given this paragraph: Red blood cells transport oxygen to the tissues so they can function. In the absence of oxygen, cells cannot carry out their biochemical responsibilities. Oxygen moves to the cells attached to hemoglobin, a protein found in the red cells. In cases of carbon monoxide poisoning, CO binds much more strongly to the hemoglobin, blocking oxygen attachment and lowering the amount of oxygen reaching the cells. Treatment involves the patient breathing pure oxygen to displace the carbon monoxide. The equilibrium reaction shown below illustrates the shift toward the right when excess oxygen is added to the system:. Q: What type of blood cells transport oxygen to the tissues so they can function? Choices: - white blood cells - mutated blood cells - depleted blood cells - red blood cells A:
(Answer)
red blood cells
Ques: Answer the following question given this paragraph: Adult sea stars and other echinoderms have obvious radial symmetry. What evidence supports the claim that echinoderms evolved from an ancestor with bilateral symmetry?. Q: Adult sea stars have what kind of symmetry? Choices: - hydrological symmetry - skeletal symmetry - biological symmetry - radial symmetry A:
Ans: radial symmetry
(Q).
Answer the following question given this paragraph: The decay of an unstable isotope to a stable element occurs at a constant rate. This rate is different for each parent-daughter isotope pair. The decay rate is measured in a unit called the half-life. The half-life is the time it takes for half of a given amount of an isotope to decay. For example, the half-life of carbon-14 is 5,730 years. Imagine that you start out with 100 grams of carbon-14. In 5,730 years, half of it decays. This leaves 50 grams of carbon-14. Over the next 5,730 years, half of the remaining amount will decay. Now there are 25 grams of carbon-14. How many grams will there be in another 5,730 years? The figure below graphs the rate of decay of a substance ( Figure below ). Q: The rate at which an unstable isotope decays is measured in a unit known as what? Choices: - full-life - staying-life - half-time - half-life A:
(A).
half-life
Ques:Answer the following question given this paragraph: Amino acids contain both a carboxylic acid group and an amine group. Q: Amino acids contain both a carboxylic acid group and what other group? Choices: - lipid - fatty - compounds - amine A:

Ans:amine
Question: Answer the following question given this paragraph: Myopia is corrected with a concave lens, while hyperopia is corrected with a convex lens. Q: What lens shape corrects myopia? Choices: - flat - convex - curve - concave A:
Answer:
concave