I think the answer is (B)...
For example, trees are dormant during Winter.
I'm assuming there is a graph to go along with the question but as a guess, The numbers of lynx and rabbits flow as opposites when rabbit population goes up soon after the lynx population wil also go up due to increase in food, then the rabbit population will go down due to the increase in predators. This patern will continue on.
Variant
Difference in the DNA sequence between two individuals
Genotyping
An analysis that looks at specific locations in DNA to identify variations
With vertebrates, all energy needs are met through the intake of nutrients in the food they eat. Of the options listed, "Several lions fight over a recent animal kill." Since the kill the the source of nutrients, it is also the source of energy. The fact that the lions are fighting implies competition. Since they are fighting for food, they are competing for energy.
The flexor digitorium profundus muscle inserts on the distal phalanges of digits II through V. The flexor carpi ulnaris muscle is one of the only anterior fore arm muscles innervated by the ulnar nerve, while the flexor pollicis longus muscle has its origin on the radius and the interosseous membrane and the flexor digitorium superficialis muscle inserts on the middle phalanges of the digits II through V.