The function of the torus in the walls of tracheids is
A. allowing the passage of water.
B. stopping backflow of water.
C. sealing off air bubbles.
D. secretion of resin.
E. allowing the escape of air.
Answer: C
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Movement in and out of a population occurs in a(n) ________ population
Fill in the blank(s) with correct word
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.Based on the experimental design, what is the independent variable?
A. Number of hatchlings B. Time eggs spent in ground C. No cloaca film on eggs D. Inducing egg laying