Final answer:
Aquarium One has the greater species diversity because it contains a greater variety of species, including multiple species of fish, snails, and plants, compared to Aquarium Two, which only includes guppies and elodea plants. The correct option is a.
Step-by-step explanation:
To determine which aquarium has the greater species diversity, we look at the number of different species present in each aquarium. Aquarium One contains: 2 goldfish, 43 snails, 12 guppies, 42 elodea plants, 1 catfish, 12 java ferns, and 2 banana plants. Aquarium Two contains: an unspecified number of guppies and 100 elodea plants.
Based on the information provided, Aquarium One has a greater species diversity, as it contains not only multiple species of fish and snails, but also a variety of plants. On the other hand, Aquarium Two has only been described to contain guppies and elodea plants.
Therefore, the correct answer is (A) Aquarium One has the greater species diversity.