Option 1: Dolphin - Dolphins are mammals, just like humans, and belong to the same class of animals called "Mammalia." Mammals are characterized by having a backbone, hair or fur, and female mammals produce milk to feed their young. Dolphins are highly intelligent creatures and share certain cognitive abilities with humans, such as problem-solving and communication skills. From an evolutionary perspective, dolphins are considered closer to humans compared to other animals.

Option 2: Shark - Sharks are fish and belong to a different class called "Chondrichthyes." Fishes are primitive vertebrates and have a completely different body structure and internal systems compared to mammals. Therefore, sharks are not considered closer to humans from an evolutionary standpoint.

Option 3: Tortoise - Tortoises are reptiles. Reptiles belong to a class called "Reptilia." They have scaly skin, lay hard-shelled eggs, and have completely different physiology and characteristics compared to mammals like humans. Therefore, tortoises are not considered closer to humans from an evolutionary standpoint.

Option 4: Wolf - Wolves are mammals and belong to the same class as dolphins, which is "Mammalia." However, while wolves are also mammals, the anatomical and cognitive similarities between wolves and