The Discovery of Microraptor Gui Is Significant in Evolutionary Biology

question 31

Multiple Choice

The discovery of Microraptor gui is significant in evolutionary biology because it strengthened which one of the following hypotheses?

• A)Vertebrates were the first group to develop a jaw.
• B)An asteroid impact caused the extinction of dinosaurs.
• C)The echinoderm endoskeleton is a trait that identifies them as a monophyletic group.
• D)The three phyla-Echinodermata,Xenoturbellida,and Hemichordata-form a monophyletic group.
• E)Birds evolved from a dinosaur ancestor.

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Definitions:

Standard Normal Variable

A standard normal variable is a random variable that follows a normal distribution with a mean of zero and a standard deviation of one.

Standard Normal Distribution

A normal distribution with a mean of 0 and a standard deviation of 1, serving as a basis for comparison for other distributions.

Mean

The arithmetic average of a set of values, calculated by adding all the values together and dividing by the number of values.

Standard Deviation

A measure of the amount of variation or dispersion of a set of values; a low standard deviation means the values are close to the mean, while a high standard deviation means the values are dispersed over a wider range.