Can someone me out a scientist is designing an investigation to study the impact of predatory trout on the population of the mountain yellow-legged frog in a recreational nature park. what is most likely the test variable (independent variable) for the study? frog population plant population trout population tourist population

Trout population

Explanation:

In any scientific study you will have at least one independent and one dependent variable. Independent variables do not change in function of other variables in the study, while dependent variables change when the independent variable changes. In the proposed study, if the scientist wants to find out the impact of trout population on the yellow-legged frog population, what they really want to find out is how much the frog population changes when the trout population changes. This means that the trout population doesn't depend of any other variables in the study, so it's independent, while the frog population depends on the trout population, so it's dependent.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.