Answer:
C. Survival is not often a struggle for most animals.
Step-by-step explanation:
Animals in their habitat need to struggle for resources because of the competition and danger around. The competition among animals for their survival is a real struggle as their are finite resources in nature and it causes struggle for existence among individuals.
But some animals are blessed with unique senses that helps animals to survive despite the obstacles and dangers they face. For example: some animals have camouflage pattern that helps the animals to blend in with its surroundings and predators are unable to recognize the prey, it protects them from predators.
Hence, special senses in animals make the survival of some animals easy and not often a struggle and the correct answer is "C."