Which organisms recycle the organic molecules of dead organisms at all trophic levels and then put the nutrients from those organic molecules back into the environment? a) parasites b) decomposers c) omnivores d) carnivores

About which of these did darwin have a poor understanding? a) that much of the variation between individuals in a population is inherited b) the factors that cause individuals in populations to struggle for survival c) the sources of genetic variations among individuals d) that individuals in a population exhibit a good deal of variation e) how a beneficial trait becomes more common in a population over the course of generations