A Major Evolutionary Change Between Thefishcirculatory System and the Circulatory

question 43

Multiple Choice

A major evolutionary change between thefishcirculatory system and the circulatory systemsofamphibians, birds, and mammalians is the presence of a

• A) separate pulmonary circuit in fish.
• B) two-chambered heart in amphibians, birds, and mammals.
• C) double-loop pathway in amphibians, birds, and mammals.
• D) stronger atria in amphibians, birds, and mammals.
• E) four-chambered heart in fish.

---

Definitions:

Dot Plot

A graphical device that summarizes data by the number of dots above each data value on the horizontal axis.

Statistics Classes

Statistics classes are academic courses focused on teaching the principles, methods, and applications of statistical analysis.

Relative Frequency Distribution

A representation of the number of times each value occurs relative to the total number of observations.

Cumulative Frequency

The sum of frequencies accumulated up to a certain point in a distribution, showing the number or proportion of observations below a particular value.