Students noticed that some of their classmates have a hard time concentrating during class. they thought
it may have some connection with the fact that these students consume energy drinks just before class. an
experiment was proposed to find out if there is a connection between energy drinks and the lack of ability
to concentrate in class. a properly designed experiment to determine this would include having
(1) the whole class drink energy drinks and no water at all, for the entire time of the experiment
(2) the whole class drink water and no energy drinks at all, for the entire time of the experiment
(3) the students drink both water and an energy drink just before class
(4) half the students drink water and the other half drink an energy drink just before class
note: the answer to question 75 should be recorded on your separate answer sheet.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.