Which statement best deschbes the variables in a controlled experiment?
The independent vanable is changed to see its effect on the dependent variable while all other conditions are unchanged.
The dependent variable is changed to see its effect on the independent variable while all other conditions are unchanged.
The independent vanable is allowed to change and the dependent variable is held constant to see what other conditions
The dependent variable is allowed to change and the independent variable is held constant to see what other conditions
a relationship

A) The independent variable is changed to see its effect on the dependent variable while all other conditions are unchanged.

Explanation:

i took the test review and it showed i got the wrong answer (the wrong answer was The independent variable is allowed to change, and the dependent variable is held constant to see what other conditions show a relationship. so DON'T PICK THAT ONE)

answer: all : )

explanation:

sheep is a herbivore animal whereas grasshopper belongs to the class chordates but both of them feed on greens.  

if grasshopper and sheep feeding on a pasture land, i do not think both of them will have any impact on each other. however, the number of the species can make difference. since sheep feed on greens, there is a possibility there left no pasture land for the grasshoppers or they may get extinct.