You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.

[EX Q]: In the Everglades, the body condition of the American alligator is closely related to water depth. When water levels rise too high, animal species disperse across a broader area, causing a decrease in body condition due to an inability to locate sufficient food sources. When water levels fall, the animal species gather in smaller areas, allowing alligators to hunt more effectively. This scenario is an example of how the survival of alligators is dependent upon the restriction of which factor?  
 (A) decomposition rate (B) prey habitat area (C) producer output (D) water turnover
[EX A]: B

[EX Q]: The equation for the synthesis of water is given below. 2H_{2} + O_{2} -> 2H_{2}O How many grams of oxygen gas are needed to produce 36.0 grams of water?  
 (A) 9.00 grams (B) 16.0 grams (C) 32.0 grams (D) 40.0 grams
[EX A]: C

[EX Q]: Paramecium and volvox can both reproduce sexually. How is sexual reproduction in volvox different than sexual reproduction in paramecium?  
 (A) Volvox colonies produce gametes. (B) Volvox cells undergo conjugation. (C) Volvox colonies produce single-celled offspring. (D) Volvox cells reproduce by vegetative budding.
[EX A]:
A

