Hard clams can tolerate low salinities or freshwater for extended periods of time. Is this statement true or false?

Hard clams, also known as Mercenaria mercenaria, are typically found in marine environments and are adapted to thrive in saline waters. While they can withstand some variation in salinity, they are not suited for prolonged exposure to low salinities or freshwater. Extended periods in freshwater can lead to osmoregulatory stress and potentially lethal conditions for hard clams, as they are unable to maintain the necessary internal salt concentration. Their physiological adaptations are aligned with a saline environment, which is crucial for their survival and reproductive success.

Overall, the statement suggesting that hard clams can tolerate low salinities or freshwater for extended periods is false, reflecting their dependence on marine conditions for their well-being.