The greenhouse effect refers to the differential transmissivity properties of atmospheric constituents
Indicate whether the statement is true or false
TRUE
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The endocrine system is least likely to be disrupted by the intake of
A. herbicides. B. PCBs. C. mercury. D. Vitamin E. E. DDT.
Waves break when wave steepness reaches a value of:
a. 1/5 b. 1/7 c. 1/2 times the wavelength d. 1/7 times the wavelength
The Great Oxygen Event marks the time, approximately 2.5 billion years ago, when ________
A) there was enough oxygen in the atmosphere to support a major burst of life on Earth B) photosynthesis was clearly established and producing oxygen. C) there was a massive volcanic eruption that lead to a very rapid increase in oxygen levels on Earth D) there was significant oxygen in the atmosphere E) there was a cataclysmic weather event that absorbed most of the oxygen in the atmosphere and locked it into iron deposits in the oceans
The domestication of plants and animals allowed humans to alter ecosystems for their benefits. Which of the following is an example of a human benefit that resulted from ecosystem change?
A) Grasslands were destroyed and replaced with forests. B) Crop production increased as a result of more plants competing for the same land space. C) Crop production increased and more people had food to eat. D) Grasslands were destroyed and predator insects were destroyed. E) Crop production decreased as natural habitats were replaced.