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.
Turgor pressure is equal to the outside pressure of the atmosphere
This is possible by having different stem cells for different types of cells which then have different genes activated to make cells different
