Which of the following is a microbial product used to reduce crop damage?
A. Bt toxin
B. saxitoxin
C. ice-minus
D. both Bt toxin and ice-minus
E. both Bt toxin and saxitoxin
Answer: D
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The rate of killing by an antimicrobial agent may slow when the microbial population has been greatly reduced because the remaining population may have a high proportion of resistant organisms.
Answer the following statement true (T) or false (F)
A situation in which the birth rate equals the death rate is called:
a. an intrinsic limiting factor b. exponential growth c. saturation d. zero population growth e. geometric growth
Which of the following is not a type of symbiosis?
A. parasitism B. mutualism C. commensalism D. predation E. None of the answer choices is correct.
How old was the world thought to be when Darwin began his voyage? How old is it thought to be
now? What will be an ideal response?