What is the main purpose of flowers?
A. To attract attention in the landscape
B. To attract pollinators
C. To attract predators
D. To be pleasing to the human eye
Answer: B
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It is currently estimated by the American Cancer Society that only about 10% of all people with melanoma have a family history of the disease. What factors might contribute to the development of melanoma in the other 90% of patients?
A. exposure to solar radiation B. mutations in a melanocyte C. exposure to environmental mutagens D. All of the answer choices are correct. E. None of the answer options is correct.
Restriction endonucleases were discovered by
A. Jackson, Symons, and Berg. B. Boyer and Cohen. C. Temin and Baltimore. D. Arber and Smith.
Which of the following is a primary lymphoid organ?
A. tonsils B. spleen C. lymph node D. bone marrow E. circulatory system
A population of 1,000 individuals with an r = 1 per
individual per year in an unlimited environment will number __________, four years later. a. 1,000 b. 1,004 c. 4,000 d. 16,000 e. 40,000