Pisaster is a type of species found in tide pools. Researchers experimentally removed Pisaster in some areas to see how the ecosystem was affected. The results are shown in the graph below.

Based on these results alone, which of the following best describes the role of Pisaster in this ecosystem?

A. Pisaster is an invasive species in this ecosystem

B. Pisaster was the top predator in this ecosystem

C. Pisaster is the only producer in this ecosystem

D. Pisaster is a keystone species in this ecosystem

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

compost can be added to topsoil as a:

pesticide

i think that it is plants

the potatoes have high sugar concentrations and although these potatoes were different we could seethe effects that their sugar concentrations had in different environments. for example, the potatoes in sample a, were placed in pure water. this created a hypertonic environment and caused the potatoes to draw in water from its surroundings. we saw the opposite happen with the potatoes in sample b when placed in the sodium chloride solution. the potatoes in this case were in a hypotonic solution and therefore lost water to their surroundings.