Darwin Observed That Bipedalism Frees the Hand to Hold Objects

question 26

Multiple Choice

Darwin observed that bipedalism frees the hand to hold objects.This led him to hypothesize that ________ was an important selective pressure on bipedalism.

• A)dental development
• B)skeletal structure of the hand
• C)tool use
• D)human vision

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Definitions:

Chi-Square Test Statistic

A value derived from the chi-square test, representing the sum of the squared differences between observed and expected frequencies divided by the expected frequencies.

Goodness-Of-Fit Test

A statistical test used to determine how well observed sample data fit a distribution from a population with a normal distribution.

Expected Frequency

The number of times an outcome is predicted to occur in an experiment or trial based on probability theory.

Normal Distribution

A distribution of probability that is even around the average, indicating that observations close to the mean are more common than those further away.