Human activity on land can have a profound influence on marine ecosystems.

This statement is true because there is a direct connection between land and sea through rivers and the beach.

When we throw garbage, toxic chemicals, etc. On land, these compounds can affect rivers washed into the sea, which would change the pH and affect organisms that live in the sea. The same phenomenon can have on the beaches.

On the other hand, the activities we do on land contribute to climate change and the greenhouse effect, which increases the temperature of the ocean and negatively affects the entire ecosystem

biology is the study of life. it is the study of living organism.