In the food web above, label all producers, primary consumers, and secondary consumers.

Secondary Consumers-Squid, Seagull, Blue Whale, Penguin

Producers-Plankton

Primary Consumers- Krill

Explanation:

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the answer is c) an oak tree

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).