12. How does the clearing of forests increase greenhouse gases?
A. O more oxygen is released into the atmosphere when vegetation is removed
B.
carbon dioxide is released when vegetation is burned or decayed
c. nitrogen gases build up in an area where forests have been removed
D.
trees are cut down and water vapor is released into the atmosphere

Which of these is a major trend in land plant evolution? a) the trend toward smaller size b) the trend toward a gametophyte-dominated life cycle c) the trend toward a sporophyte-dominated life cycle d) the trend toward larger gametophytes

Which set of characteristics best describes sedimentary rock? a) largest type of rock, made of organic matter, hardest type of rock b) often contains layers, forms near sources of water, contains fossils c) least abundant type of rock, made of other rocks, made mostly of minerals d) most abundant type in earth's crust, made of magma/lava, contains no fossils

Regarding most of the narrator’s story, which word best describes the tone?