What type of speciation occurs when a plant population becomes reproductively isolated while living with its parents population?

Look at the picture below . what does this picture represent ?

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

Which is an example of a population?