Veins returning to the heart can close to prevent the backflow of blood. which component in the veins contributes to this process? a. connective tissue in the tunica media b. smooth muscle in the tunica media c. endothelium in the tunica intima d. movable valves in the tunica intima

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?

Everything that surrounds a particular organism

Which factor affects the force of gravity between objects? check all that apply. direction distance mass shape time