Which one of the following represents the greatest expanse of geological time?
What will be an ideal response?
Precambrian
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The types of coal include bituminous, lignite, subbituminous, and anthracite. Anthracite is the best
because it burns more cleanly and efficiently than the other types. What will be an ideal response?
Purple martins are the largest species of swallow in North America. In the Eastern United States, they breed almost exclusively in large colonies in artificial martin houses and hollowed-out gourds hung by martin enthusiasts
Given this information, which of the following would be a valid inference? A) Purple martins and martin enthusiasts exhibit a relationship that can best be described as commensalism. B) In the eastern United States, purple martins have a size advantage over other swallows and are able to outcompete them for nest sites. C) In the eastern United States, purple martins are specialists because they rely almost solely on humans for nesting sites. D) In the eastern United States, purple martins are generalists with a broad ecological niche.
A low-throughput economy works best when population growth can be slowed.?
Answer the following statement true (T) or false (F)
Briefly explain how magnetic patterns on the seafloor support Plate Tectonic theory
What will be an ideal response?