Answer:
Parasitism
Explanation:
One organism benefits, and one is harmed.
Genetics, double helix, cells
Answer:
The brackish water adaptation is clearly necessary because the aquatic snails need to live in an environment in which the river system has a higher quantity of salt than what land snails can take. I can determine that the environmental factors influenced the inherited adaptations because the second population has a higher salt concentration in their habitat compared to the initial population.
Cutaneous membrane also known as the skin
