Which of the following statements is true?

a)decomposition and weathering recycle matter in an ecosystem.

b)the total amount of energy in an ecosystem is always increasing.

c)primary consumers break down dead organisms into essential chemicals.

d)water is part of an open system, which means it must be continuously replenished in an ecosystem.

Option A

Explanation:

The process of decomposition and weathering recycles the nutrients in an ecosystem. Decomposition is the process by which the complex matter is broken down into simpler organic matter.

The weathering is the process by which the mountains are broken soil to form soil that recycles the salts and minerals into the soil.

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

the answer is b.) hydrogen bonds between bases.