In a salt marsh in Georgia, the quantity of solar radiation reaching the ground during the summer is 7,000,000cal/m2/day. The gross productivity of the producers in the salt marsh (mostly microscopic algae) is 0.0040 g/cm2/day. The average rate of respiration (the respiration requirement) is 35% of the gross primary productivity. Ecologists have found that 1 gram of salt marsh producers (the algae) is equivalent to 2,920 calories. a. Calculate the net primary productivity of the system, in g/m2/day. b. Calculate the efficiency of photosynthesis

Let r(t) represent the rate, in square feet per minute, at which a groundskeeper is mowing a lawn t minutes after 3 p. m. what expression represents the area, in square feet, of the lawn that is mowed between 3 p. m. and 5 p. m.?

"[because of the emancipation proclamation] the condition of things [became] … unsettled, revolutionary, with nothing clearly defined, neither slave nor slaveholder having any rights which they felt bound mutually to respect … slave property in the state of missouri was almost a dead weight to the owner; he could not sell because there were no buyers."—h. c. bruce, a former slave in missouri what does this excerpt suggest about the effects of the emancipation proclamation? a. it also undermined slavery in the border states despite not being in effect there. b. it caused complete disintegration of southern society in the states that seceded. c. it led to slave owners not even trying to stop their slaves from leaving the farms. d. it prevented riots or chaos as both owners and slaves simply ignored each other.

Recycled water is best used for a) drinking b) bathing c) lawns d) dishes e) laundry