In a molecule of methane, CH4, each hydrogen atom shares an orbital with the carbon atom. The total
number of shared electrons in CH4 is ____.
a. 4
b. 2
c. 1
d. 8
e. 5
D
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Which of the following statements about invasive species is false?
A. The effect of invasive species on natural communities is always a reduction in diversity. B. Humans are responsible for dramatic increases in the number of invasive species. C. Invasive species often thrive in new areas because they have few natural predators. D. Introduction of invasive species has more devastating effects on islands because of the smaller number of predators and competitors in these systems. E. Invasive species reduce community diversity through displacement, competition, and predation.
Why is the traditionally defined taxon Reptilia paraphyletic?
What will be an ideal response?
The prebiotic soup hypothesis proposes that organic molecules formed from cracks in the ocean floor
______________ Indicate whether the statement is true or false.
Two categories of organic compounds typically provide energy for living systems. Representatives of these two classes are
A) lipids and proteins. B) carbohydrates and lipids. C) carbohydrates and nucleic acids. D) carbohydrates and proteins. E) proteins and nucleic acids.