Why is an ecosystem's net primary production (npp) lower than its gross primary production (gpp)?
a. npp reflects the loss of matter due to respiration by the primary producers.
b. npp reflects the gain of oxygen due to respiration by the primary producers. c. gpp reflects the loss of matter due to respiration by the primary producers.

Turtle hatchling survivorship rate is low in many turtle species due to predation. amanda researched the predatory rate on a species of turtle eggs in the red river. the eggs were harvested from trapped turtles and the egg's cloaca film (reproductive discharge) was either washed off or left on once gathered. research suggests that predators use the female's cloaca scent to locate the eggs. the eggs were only handled when wearing gloves and then reburied along islands where the turtles were trapped. the nests were monitored by cameras and manually on foot and data on nest predation were recorded. a. based on the experimental design, what is the dependent variable? b. based on the experimental design, what is the independent variable? c. based on the experimental design, what is the control?

Hershey and chase confirmed that dna, not protein, was the genetic material. how do the results of their two experiments support this conclusion?

Which characteristic should describe all evidence collected by a scientist? true obvious objective subjective