2. Out of these 5 animals, The animal that must eat most frequently to meet its energy needs is

a. raccoon
b. frog
c. snake
d. worm
e. grasshopper

To determine which animal must eat most frequently to meet its energy needs, we need to consider the metabolic rate and energy requirements of each animal. The higher the metabolic rate, the more frequently an animal needs to eat.

Let's analyze the options:

a. Raccoon: Raccoons are mammals and have a higher metabolic rate compared to other animals on this list. However, they do not need to eat as frequently as some other animals due to their larger body size, energy reserves, and ability to conserve energy. Therefore, raccoons are not likely the animal that must eat most frequently.

b. Frog: Frogs are ectothermic (cold-blooded) animals with a relatively low metabolic rate. As a result, they do not require as frequent feeding as some other animals on this list.

c. Snake: Snakes are ectothermic predators, and while they have a relatively low metabolic rate, they typically eat relatively large meals. Snakes can go for significant periods without eating after a substantial meal. Therefore, snakes are not likely the animal that must eat most frequently.

d. Worm: Worms have a relatively low metabolic rate due to their small size and simple body structure. They can survive for extended periods without feeding. Therefore, worms are not likely the animal that must eat most frequently.

e. Grasshopper: Grasshoppers are ectothermic, meaning they have a low metabolic rate. However, they are herbivores and typically have higher energy requirements compared to other animals on this list. Grasshoppers need to feed frequently to meet their energy needs by consuming plant matter.

Based on these considerations, the animal that must eat most frequently to meet its energy needs out of the given options is the grasshopper (option e).