(twenty points)
of the resources below, which one is perpetual?
fish
coal
timber
tidal energy

D. Tidal energy

Explanation - Resources generally get exhausted if used endlessly and in large quantity. Resources that cannot be replenished are called as non-renewable sources like coal. Perpetual resources are those resources that are present abundantly or less likely to get exhaust even when used endlessly.

They are also called as renewable source. Example of perpetual resources are solar energy, tidal energy etc. Fish if consumed in large quantities might get extinct in near future.  

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.

answer: national resource conservation services

national resource conservation services is the us. based approach that provides technical and financial assistance for natural resource management. nrcs society in conservation of resources by involving in activities like farmland protection, flood prevention, watershed protection, urban conservation, conserves economic and environmental conditions. it conducts soil surveys and implements the policy of natural resources management on the society.