The competitive exclusion principle states ________.
a) two species cannot occupy the same niche in a habitat
b) certain species can have disproportionately large effects relative to their abundance
c) certain small areas hold unusually large number of species
d) nonnative species introduced into a new ecosystem can cause native species to go extinct
Answer: a) two species cannot occupy the same niche in a habitat
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Shannon diversity (Hs)
A. goes up with increases in the number of species sampled and is higher when individuals are more equitably distributed among species. B. is higher when individuals are more equitably distributed among species. C. is independent of abundance. D. increases in areas undergoing secondary succession. E. is higher when individuals are more equitably distributed among species and is independent of abundance.
The vascular tissues of plants are composed of
a. epidermis and ground meristem. b. ground tissue. c. xylem and phloem. d. arteries and veins. e. sap and water.
Refer to Figure 46-1. The structures receiving air in figure 1 are known as:
a. anterior air sacs. b. parabronchi. c. spiracles. d. alveoli. e. tracheae.
Organisms from the genus Aspergillus are used in the production of
A. cellulase. B. pectinase. C. proteases. D. amylase. E. All of the choices are correct.