Which of the Following Could Be Considered the Most Recent

question 86

Multiple Choice

Which of the following could be considered the most recent common ancestor of living tetrapods?

• A)a sturdy-finned,shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates
• B)an armored gnathostome with two pairs of appendages
• C)an early ray-finned fish that developed bony skeletal supports in its paired fins
• D)a salamander that had legs supported by a bony skeleton but moved with the side-to-side bending typical of fishes

---

Definitions:

Sophomores

Second-year students in a four-year degree program at a high school or university.

Critical Value

A point on the scale of the test statistic beyond which we reject the null hypothesis; it marks the threshold for significance.

Hypotheses

Proposed explanations or predictions that can be tested through research and experimentation.

T-statistic

A type of statistic used to estimate the population parameter based on a sample statistic.