A because a physical change , changes the appearance. the multiple choice question is A.
Check the photo I sent for answer
A.) Guanine = 45
B.) Adenine = (100 - 90 )/ 2 = 10/2 = 5
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The answer is “d” (1,000 kcal). As the trophic level increases energy is decreases by 10 times that of the previous level. If a system has 10,000 kcal, then the primary consumer have 10 times less (10,000/10) which is 1,000 kcal. The secondary consumers have 100 kcal and the tertiary have 10 kcal. Only 10% of the energy at each trophic level goes on to the next.
