The letter “B” in the above figure represents
a. sclerenchyma fibers.
b. parenchyma.
c. xylem.
d. epidermis.
e. phloem.
Answer: b
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In humans, the stem cells from which all blood cells arise are found in the
A. peripheral circulation. B. lymphatic vessels. C. lymph nodes. D. bone marrow.
What abiotic feature heavily influences the number of species and the types of species in an area?
a. Sunlight b. Sediments c. Plate tectonics d. Currents
In order for all hormones to cause a response, they must first bind to an appropriate receptor on the target cell's membrane.
a. true b. false
In many ways, a mule is a superior animal to the horse or donkey. Mules are often stronger and can jump higher than either of their parents. Why, then, are mules considered to be a "weak hybrid"?
A) They are sterile. B) They do not live as long as horses and donkeys. C) Their offspring are progressively weaker than the parents. D) They are more prone to disease than are horses and donkeys.