Answer:
The intertidal zone
Step-by-step explanation:
The intertidal zone of the ocean is the zone present between the low and high tide. The intertidal zone is characterized by the availability of ample nutrients, light, and oxygen which in turn favor the survival of many organisms in this zone.
Hence, the zone is inhabited by sand dwellers, seaweeds and many invertebrates such as mussels and barnacles. Seaweeds are mostly found anchored to the rocky shore.
Hence, if David wants to write about these organisms, he needs to describe the intertidal zone of oceans.