What are the physical and biological components of seagrasses

Seagrass environments are characterized by physical conditions like temperature, salinity, currents, waves, turbulence and light. Each of these parameters has the potential to affect the vegetation from the smallest (molecular and physiological) to the largest (ecosystem as well as global) scale.

Explanation:

the trilobite is used as an index fossil for various geologic time periods as specific types of the trilobites were present in different geological time periods. they are a group of marine arthropods belonging to the class of trilobita.

explanation:

answer; i believe the answer is hydraulic action;