What is the likely cause of "colony collapse disorder" in honeybees?
A) an increase in predators
B) overexploitation
C) an increase in parasites
D) greater genetic variability
C
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The boundary between the middle ear and the
inner ear is the
a. eardrum. b. oval window. c. cochlea. d. stirrup. e. auditory canal
The enlarged cell in this image is a Gaucher cell, found in individuals suffering from Gaucher disease. Gaucher cells are actually _____
1.nonfunctional lysosomes containing glucosylceramides
2.lysosomes lacking an active form of one enzyme
3.macrophages lacking an active form of one enzyme
4.nonfunctional macrophages containing glucosylceramides
Tears drain into the
a. nasal cavity. b. anterior chamber of the eye. c. corneal space. d. conjunctiva. e. optic nerve.
Which of the following statements is NOT consistent with evolution by natural selection?
a) Natural selection can lead to speciation. b) Individuals change during their lifespans to fit their environment better, and these changes can be inherited by their offspring. c) Individuals in a population exhibit variation, some of which can be inherited by their offspring. d) Natural selection can reduce genetic variation in a population. e) Natural selection can prevent speciation from occurring.