Which Feature Did Tiktaalik Possess That Were Not Possessed by Earlier

question 62

Multiple Choice

Which feature did Tiktaalik possess that were not possessed by earlier vertebrates?

• A) fingers and toes
• B) a flexible wrist
• C) fins
• D) lungs
• E) gills

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Definitions:

Discrete Random Variable

A variable that takes on countable values, each with a certain probability.

E(x)

The expected value of a random variable x, representing the mean or average outcome.

Variance

A measure of how much values in a dataset differ from the mean of the dataset, indicating the spread of data points.

Discrete Probability Distribution

A statistical function that describes the probability of occurrence of each value of a discrete random variable.