David is interested in writing about seaweed, fish, and invertebrates for his research on oceans. in which zone are seaweed, fish, and invertebrates found in an ocean?

The correct answer is in the intertidal zone.

Explanation:

The zone present in between the high and low tide of the ocean is known as the intertidal zone. The intertidal zone is featured by the accessibility of ample light, oxygen, and nutrients that in turn support the survival of various species in this zone.  

Thus, the zone is inhabited by seaweeds, sand dwellers, and various invertebrates like barnacles and mussels. The seaweeds are majorly witnessed anchored to the rocky shore. Therefore, if David desires to write about the mentioned species, then he needs to illustrate the intertidal zone of the oceans.  

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.