Charlie hypothesizes that if he adds earthworms to a compost pile, it will decompose twice as fast as a compost pile without earthworms. which of the following steps could compromise his experiment?
start two compost piles at the same time with the same materials.
add earthworms to one compost pile.
add decomposing bacteria to the other compost pile.
rate the level of decomposition in each compost pile every week.
report his results.
a.
step 1
b.
step 4
c.
step 2
d.
step 3

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.