DDT was once considered a "silver bullet" that would permanently eradicate insect pests. Instead, DDT is largely useless against many insects. Which of these would have prevented this evolution of DDT resistance in insect pests?
A) All habitats should have received applications of DDT at about the same time.
B) The frequency of DDT application should have been higher.
C) None of the insect pests would have genetic variations that resulted in DDT resistance.
D) DDT application should have been continual.
C
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a. two b. four c. 10 d. 100 e. 1,000
Which of the following statements about the function of flowers is TRUE?
A) They provide nutrients to the embryo. B) They protect seeds until they are mature. C) They attract seed dispersers. D) They aid in the dispersal of seeds. E) They attract pollinators.
The full range of electromagnetic energy is called the ________ spectrum
A) visible B) electromagnetic C) energy D) ultraviolet
A couple visits a fertility clinic to determine the basis of their difficulty in conceiving a child. They are surprised to hear they will both be tested for levels of two of the same hormones, which play roles in the ovarian cycle and sperm production. Which hormones are they?
A. Follicle-stimulating hormone (FSH) and luteinizing hormone (LH) B. Insulin and glucagon C. Oxytocin and luteinizing hormone (LH) D. Adrenocorticotropic hormone (ACTH) and corticotropin-releasing hormone (CRH)