Snails Typically Avoid Sunlit Areas,but Some Snails Infected with Certain

question 20

Multiple Choice

Snails typically avoid sunlit areas,but some snails infected with certain parasites become attracted to light and prefer sunlit areas.Which of the following is the most likely hypothesis given the life cycles of many parasites?

• A)The parasite itself must be exposed to light in order to survive in the snail.
• B)The parasite manipulates the behavior of the snail so that it gets eaten more readily,which allows the parasite to complete its life cycle.
• C)The snail is behaving differently in order to rid itself of the parasite.
• D)The snail is dying from the parasite and is therefore looking for the light.
• E)The parasite must exit the snail in a sunlit area in order to move and find its next host.

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Definitions:

Expected Cell Counts

In chi-squared tests, these refer to the theoretically predicted frequencies of observations in the categories of a contingency table under the null hypothesis.

Degrees of Freedom

The number of independent values or quantities which can be assigned to a statistical distribution or in the calculation after estimating certain parameters.

Contingency Table

A table used to display the frequency distribution of variables and analyze the relationship between categorical variables.

Null Hypothesis

A statistical hypothesis that assumes no significant difference or effect and serves as the default or starting assumption in hypothesis testing.