yes, a dolphin is a marine mammal
Dolphins are marine mammals, they do not live on land.
Marine mammals do not live on land, and no marine mammals lay eggs. Marine mammals include whales, dolphins and porpoises.
The marine mammals are "dolphins." (The NFL team is the Miami Dolphins.)
Dolphins are marine mammals that are closely related to whales and porpoises.
Some do. For example, dolphins and whales are marine mammals and they have fins.
Yes they are. In fact they are marine MAMMALS in the Order Cetacea.