Which plant tissue contains cells called tracheids?
A) phloem B) meristematic tissue
C) ground substance D) xylem
Answer: D
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In Connell's experiments with the barnacles Chthamalus stellatus and Semibalanus balanoides, the potential distribution of each species, in the absence of the other, is known as the
A. competition zone. B. idealized niche. C. fundamental niche. D. tidal boundary. E. realized niche
is easy to recognize a turtle as a turtle, but why has it been difficult to categorize them
taxonomically?
What will be an ideal response?Therapeutic cloning could be used for
a. replacing defective genes. b. producing missing factors. c. growing replacement human tissues and organs. d. genome identification. e. producing designer babies..
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