Secondary succession is likely to occur in a(n) ____.
A. burned forest only
B. shallow lake only
C. abandoned field only
D. burned forest and an abandoned field
E. burned forest, a shallow lake, and an abandoned field
Answer: D
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Which of the following statements about communication among bacteria is correct?
A. At lower population density, a higher concentration of signaling molecules is typically observed. B. Unlike eukaryotes, in bacterial communication no receptor molecule is required. C. Small peptides can stimulate a DNA uptake response. D. Cellular communication in bacteria is based on the same principles as communication within multicellular organisms.
Why is it so necessary for cells to communicate with each other in a regulated way?
What will be an ideal response?
What is the difference between a first messenger and a second messenger? Give an example of each. What will be an ideal response?
In the digestive system, most nutrient absorption occurs in the
A) stomach. B) pancreas. C) small intestine. D) large intestine.