Discuss the problems that plants had to overcome to adapt to life on land. How did they overcome these problems? What will be an ideal response?
When plants made the transition from water to land, they had to solve most of the same
problems that animals did: desiccation, support, reproduction, and the effects of gravity. Most
experts agree that the ancestors of land plants first evolved in a marine environment, then
moved into a freshwater environment before finally moving onto land. In this way, the
differences in osmotic pressures between saltwater and freshwater were overcome while the
plant was still in the water.
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Infrasonic sound waves have relatively
A. low frequencies. B. long wavelengths. C. both of these D. none of the above
The eye wall of a hurricane has all of the following characteristics, except
A) thick cloud cover. B) moderate winds. C) intense precipitation. D) saturated air.
What do wastewater treatment facilities primarily depend upon for the breakdown of organic materials in wastewater?
A) The neutralizing effects of high levels of oxygen B) Microorganisms C) Large amounts of antibiotics and disinfecting chemicals D) Lots of chlorine bleach
Which African nation does the United States consider an economic powerhouse and critical to the stability of the continent?
a. Botswana b. Lesotho c. Swaziland d. South Africa e. Congo