If s denotes smooth and s denotes curly b denotes black and b denotes chestnut classify the alleles according to their types

a. decomposes use carbon from dead organisms as fuel for cellular respiration, returning carbon dioxide back into the atmosphere.

your answer is "the 1950's"

more words for this could be abiotic and biotic

abiotic: living organisms within an ecosystem

biotic: non-living organisms within an ecosystem