Final answer:
Hydras are predicted to be better able to cope with the changing environment in a freshwater lake being acidified because of their adaptability and regenerative abilities. Jellyfish, being more sensitive to changes in pH and salinity, may not fare as well.
Step-by-step explanation:
When considering the effects of acidification on aquatic life within a freshwater lake, it is essential to analyze the resilience mechanisms available to the differing species. In the context of hydras and jellyfish, hydras are typically more adaptive to changing environmental conditions. Hydras have the ability to regulate their internal environment and are known for their remarkable capacity to regenerate, which may provide an advantage under stressful conditions.
Furthermore, the process of acidification can significantly alter the pH of the water, affecting the survival of many aquatic species. Acidified water can damage sensitive tissues, disrupt metabolic processes, and cause a decline in species not adapted to such conditions. Hydras, due to their simple body plan and adaptability, are hypothesized to fare better than jellyfish, which are more sensitive to changes in salinity and the ionic composition of their environment, traits typically associated with more specialized and less adaptable organisms.