_________ speciation occurs within a species in a single geographic area.
Fill in the blank(s) with the appropriate word(s).
Sympatric
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Many introduced species have had deleterious
effects on communities and ecosystems because
a. coevolved parasites and pathogens are absent. b. the introduced species are long-lived. c. predators prefer the introduced species, and the local prey therefore proliferate to dangerously high levels. d. the community from which they came lost an important predator, competitor, or parasite. e. human beings do not know how to appreciate them
Which of the following is not part of the appendicular skeleton?
A. pelvic girdle B. sternum C. pectoral girdle D. femur E. humerus
A root cap:a
protects the fragile meristematic cells at the root tip. b. pushes the root tip deeper into the soil. c. protects the cells located in the lateral meristem. d. arises from the stem apical meristem. e. will differentiate into primary tissues of the adult plant.
Which substance might induce seeds treated with it to break dormancy?
A) an auxin B) a cytokinin C) a gibberellin D) ethylene