During a six week study, one tank of fish is fed once a day, one tank of fish is fed twice a day, and another tank is fed four times a day. The fish’s weights are recorded daily. Name two variables that would need to be controlled in each fish tank.’’

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

21 stacks

step-by-step explanation:

divide 630/30

21 stacks

enjoy!

explanation:

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