to test her hypothesis the forest set up an experiment she plays fencing around a group of 15 young hemlocks to prevent deer fro
m eating them she left a group of 15 young trees with no fencing around a beach day she examine the tree for evidence that dear had been eating their twigs and branches and counted the number of trees with visible white marks which is the control group of the experiment?
Bacteria that change nitrogen gas from the atmosphere into solid nitrogen usable by plants are called nitrogen-fixing bacteria. These bacteria are found both in the soil and in symbiotic relationships with plants.
