The development of new varieties of grain crops increased productivity by increasing the
A) surface area of the leaves of the plants.
B) size of the roots and ability to absorb water.
C) strength of the stems to support more grains.
D) size and number of seeds.
D
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Even though the thermosphere is the hottest atmospheric layer, explain why this layer would not actually feel very warm.
What will be an ideal response?
What is biochemical oxygen demand?
A. amount of oxygen required to decay a certain amount of organic matter B. method by which settled organic matter is returned to aeration tanks C. a necessary material that is in short supply D. None of these are correct.
What describes the theoretical direction of Ekman transport in the Southern Hemisphere?
a. 30° to the left of wind direction b. 45° to the left of wind direction c. 45° to the right of wind direction d. 90° to the left of wind direction e. 90° to the right of wind direction
The Moon and Sun cause the tides in Earth's oceans because of
A. gravity. B. magnetic pull. C. heat.