Barry is applying the principales of relative dating to a building that has been constructed. Analyzing a section of the building, barry says that the lowest part of the section must have been constucted by the parts above it were constructed. He bases this conclusion on the principle of . aslo , looking at a crack forming in the building wall , he says that the crack must be the wall . barry used the principle of to arrive at this conclusion

Which would be an adaptation in a rainforest, but not in a tundra? a. ability to store water for a long time b. fur that blends in with snow c. strong claws for killing prey d. a beak that can dig into thick trees

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?

An easy way to calculate the amount of energy available at each level is to what?