The negative impact humans could have on an ocean ecosystem is pollution, which can lead to a mass extinction on the wildlife.
The organism which is least similar to the other animals is the blue whale. This is because it belongs to the order cetacea while the other animals belong to the order carnivora. This means that the other animals are carnivorous in their mode of feeding but blue whale is not.
B.when the eye reaches the land mass
D. DNA
All organisms contain dna