Answer :

Answer: Coastal process like waves,tides and wind affect the coastline and impact primary productivity.

Explanation:

This process affect primary productivity in following ways:

a-Positive effects:

1-waves and currents bring nutrients from the ocean floor,supporting phytoplankton growth.

2-Coastal processes create habits like beaches,dunes which support diverse plant and animal communities.

b-Negative effects:

1-causes erosion

2-sedimentation ,which can smoother habitat and reduces light and oxygen for plants and animals