When biologists Hetz and Bradley measured the oxygen concentration inside the tracheae of Atlas moth pupae, what hypothesis were they testing?
A. Discontinuous breathing protects against too much oxygen.
B. Discontinuous breathing decreases water loss.
C. Discontinuous breathing helps underground insects avoid high levels of carbon dioxide.
D. Discontinuous breathing saves energy by not moving the diaphragm.
E. Discontinuous breathing is harmful because less oxygen is taken up.
A. Discontinuous breathing protects against too much oxygen.
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Answer the following statements true (T) or false (F)
1. The island biogeography model of Robert MacArthur and E.O. Wilson attempts to predict an equilibrium number of species on an island based on the immigration of new species and the extinction of resident species. 2. Tree species richness in the United States is highest in the southeast. 3. In the Shannon diversity index, communities with more species evenness will tend to have a higher H. 4. Joseph Connell proposed that at low rates of disturbance, a community will become dominated by K-selected species.
What type of pressure is not placed upon the environment as crop production expands? a. Pesticide runoff into the rivers
b. Runoff clogging rivers. c. Increase in irrigation. d. Loss of topsoil. e. Additional habitat available for many species.
The two most important factors that determine an area's climate are:a
temperature and wind. b. humidity and temperature. c. temperature and precipitation. d. cloud cover and wind. e. humidity and fog.
Which of the following muscles is under voluntary control?
A. uterus B. intestine C. heart D. biceps