A pheromone is a ________
A) strong herbicide
B) species-specific chemical attractant
C) chemical that travels in the bloodstream and controls an organism's growth and development
D) predator used to manage a pest naturally
E) new form of chemical insecticide waiting FDA approval
Answer: B
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Seedless vascular plants lived in low wet habitats because
a. they needed water to reproduce. b. they did not have a means to transport water through their structure. c. they had no protection from desiccation. d. they were a food source for amphibians. e. none of the above
Whaling in the Atlantic has been historically important for the people of this island, with a small but rapidly expanding human population size.
A. Iceland B. Cyprus C. Ireland D. Malta E. United Kingdom
Operationally, the affine transformation of a satellite image involves three sequential steps. What are these steps?
What will be an ideal response?
Which type of agriculture is found primarily in less developed countries?
A) Mediterranean B) plantation C) truck farming D) commercial gardening E) None of these is found in LDCs; they are all commercial agriculture.