When cultivars require adaptations not currently in their genetics, plant breeders
A) may treat the seeds with chemicals that cause mutations in order to try to generate new forms.
B) often introduce traits found in wild varieties of the plant.
C) may try to introduce genetic traits found in pests of the crops.
D) use fertilizers to change the chemistry of the crops.
B
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Consider an airplane flying from standard temperature air into warmer than standard temperature air. Without making any correction, the altimeter in the warmer air would indicate which of the following conditions?
A. an altitude exactly the same as the airplane's altitude B. an altitude correction factor to be used by the pilot C. an altitude higher than the airplane's actual altitude D. an altitude lower than the airplane's actual altitude
Tides are the hourly changes in the elevation of the ocean surface.
a. true b. false
The volcanic landform exhibiting a large circular depression with steep walls and a fairly flat floor, and formed after an eruption as the center of the volcano collapses into the drained magma chamber below is called:
a. Columnar joints b. Caldera c. Pillow lava d. Lava tubes
Where are most volcanoes located?
A. At divergent plate boundaries B. At mountain ranges C. At convergent plate boundaries