Weeds are commonly defined as any
A) monocot that has flowers, grows closely to the ground, and consumes nutrients in the soil.
B) dicot that blooms for more than one month of the year and competes with turf grasses for sunlight.
C) plant that competes with crops, forests, or forage grasses for sunlight and nutrients.
D) plant that is found growing outside of its native ecosystem.
C
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All the following are components of the mixture of gases known as photochemical smog EXCEPT
A. Volatile organic compounds B. Nitrogen dioxide C. Ozone D. Peroxyacetyl nitrates (PAN)
__________ drastically altered the ethnic make-up of the Caribbean.
Fill in the blank(s) with the appropriate word(s).
Beneath some valleys in East Africa and in a large area called the Basin and Range Province in the western United States and northern Mexico, the crust ____
A)appears to be in the initial stages of rifting B)appears to have undergone numerous earthquakes in the last 1000 years C)is much thicker than it is in the surrounding areas D)is composed mostly of basalt E)is composed of fragments of extinct volcanoes
In the late medieval period, various technologies like the heavy plow and waterwheels were introduced in Europe. Where did these innovations come from?
A) Arabs, Indians, and Chinese B) Carpathian Mountains C) Florence, Rome, and Venice D) Jews E) North Africans