Why Do Ecologists Say That Earth Is a Closed System

question 31

Multiple Choice

Why do ecologists say that Earth is a closed system for matter?

• A) They say this because there are no new inputs of matter.
• B) They say this because there is no net loss of matter.
• C) They say this because matter cycles in and out of organisms in ecosystems.
• D) They say this because matter stays in the biosphere.
• E) All of the above are correct.

---

Definitions:

Split-off Point

In process costing, the stage in production where multiple products emerge from a single process and continue to be processed further or sold as is.

Joint Production Costs

Costs that are incurred up to the split-off point in a process that produces multiple products.

Absorption Costing

This accounting style integrates all facets of manufacturing costs—direct materials, direct labor, and both variable and fixed overheads—into the comprehensive cost of a product.

Markup

The amount added to the cost of goods to cover overhead and profit, determining the selling price.