The plant response in which stems grow upward and roots grow downward is called
A. photoperiodism.
B. thigmotropism.
C. phototropism.
D. gravitropism.
Answer: D
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The MOST important potential common source of infectious disease is
A) industrial waste. B) arthropod reservoirs found near surface water supplies. C) water. D) human and animal wastes.
What technical advance allowed Walther Flemming and other scientists of his generation to better understand the stages of mitosis and meiosis?
A. the ability to obtain single cells B. the ability to slice cells thinly C. microscopes with two eyepieces D. microscopes with high-quality oil immersion lens E. electron microscopes
An organ is defined as
a. one or more tissue types that perform specific functions. b. a tissue that is unique is its function. c. various tissues that perform different functions. d. two or more tissues organized and capable of carrying out a specific task. e. none of these.
The practice by which athletes abuse commercial erythropoietin by injecting it to increase the oxygen-carrying capacity of the blood is known as ________
Fill in the blank(s) with correct word