Sunspots appear dark because they are cooler than the surrounding solar surface
Indicate whether the statement is true or false
TRUE
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Find the nearest neighbor statistic for the following pattern, assuming a study area of 15 by 15 km. Test the null hypothesis that the pattern is random by finding the z statistic.
North America is one of the top four global population clusters
Indicate whether the statement is true or false.
What happened to the Cuyahoga River in Cleveland in 1969?
A) massive amounts of pig farm waste was discharged B) acid mine drainage raised the water pollution to toxic levels C) it caught fire D) it was declared to be in violation of the Clean Water Act
Bullfrog tadpoles are often sold as fish bait, even in areas where they do not occur naturally. When people buy 10 of them and don't use them all, they often dump the remainder into the lake or river. This is an example of ________
A) inbreeding B) introduced species C) extirpation D) overharvesting of species from the wild E) habitat destruction