In Ecosystems, Why Is the Term Cycling Used to Describe

question 27

Multiple Choice

In ecosystems, why is the term cycling used to describe material transfer, whereas the term flow is used for energy exchange?

• A) Materials are repeatedly used, but energy flows through and out of ecosystems.
• B) Both material and energy are recycled and are then transferred to other ecosystems as in a flow.
• C) Materials are cycled into ecosystems from other ecosystems, but energy constantly flows within the ecosystem.
• D) Both material and energy flow in a never-ending stream within an ecosystem.
• E) None of the choices is correct.

---

Definitions:

Statistical Significance

A measure of whether observed data can be considered as not being the result of chance, typically through the use of a p-value.

Dependent-Samples T-Test

A statistical procedure used to compare means from the same group at two different times or under two different conditions.

Regression

A statistical method that models the relationship between a dependent variable and one or more independent variables, predicting the former based on the latter.

Analysis of Variance

A statistical method used to test differences between two or more means by analyzing variance.