(Q).
Q: What natural destructive element cuts away at rock forming river valleys? Read this paragraph and choose the correct option from the provided answers: Lactic acid fermentation converts the 3-carbon pyruvate to the 3-carbon lactic acid (C 3 H 6 O 3 ) (see Figure below ) and regenerates NAD + in the process, allowing glycolysis to continue to make ATP in low-oxygen conditions. Since there is a limited supply of NAD + available in any given cell, this electron acceptor must be regenerated to allow ATP production to continue. To achieve this, NADH donates its extra electrons to the pyruvate molecules, regenerating NAD + . Lactic acid is formed by the reduction of pyruvate. Choices: - sediment - lava - air - water A:
(A).
water

(Q).
Q: Where do all plants come from? Read this paragraph and choose the correct option from the provided answers: All plants are adapted to live on land. Or are they? All living plants today have terrestrial ancestors, but some plants now live in the water. They have had to evolve new adaptations for their watery habitat. Choices: - phylogenetic ancestors - distant ancestors - cetacean ancestors - terrestrial ancestors A:
(A).
terrestrial ancestors

(Q).
Q: Which group of metals in the periodic table include elements such as sodium and potassium? Read this paragraph and choose the correct option from the provided answers: The first step in the process of inductive reasoning is making specific observations. In the periodic table of elements, which we will discuss later, there is a group of metals with similar properties called the alkali metals. The alkali metals include elements such as sodium and potassium. If I put sodium or potassium in water, I will observe a very violent reaction every time. I draw a general conclusion from these observations: all alkali metals will react violently with water. Choices: - igneous metals - actinides - lanthanides - alkali metals A:
(A).
alkali metals