What are the answers to 10 and 11?

The correct answer is -

10. 20 J

11. 29.31 %

Explanation:

According to the law of 10% energy transfer, the energy only transfers 10% energy from one tropic level to another and the rest 90% lost in the form of heat during the metabolic and excretion process.

So, 2000 J transfers only ten percent to the primary consumer that is 200 J and then ten percent of that transfers to long-tailed weasels that are 20 J.

11. The percentage efficiency -= energy after transfer*100/transfer before the transfer

= 350*100/1170 = 29.31%

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).