Answer:
Everything seems correct except the barracuda dosen't have any prey. I don't have access to the mentioned marine biologist's research journal essay, so i don't know about anything else.
Explanation:
Erosion and mixed composition. Wind,rain have a way of mixing and can create crystals
There are often not more than one or two independent variables tested in an experiment, otherwise it is difficult to determine the influence of each upon the final results. There may be several dependent variables, because manipulating the independent variable can influence many different things.
When they interact with each other the organism is gonna die