A Porous Test (Shell) of Calcium Carbonate, Through Which Pseudopodia

question 49

Multiple Choice

A porous test (shell) of calcium carbonate, through which pseudopodia protrude, is characteristic of ________.

• A) diatoms
• B) foraminiferans
• C) ciliates
• D) water moulds

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Definitions:

Marginal Cost

The cost incurred by producing one more unit of a good or service.

Marginal Benefit

The gain in satisfaction or utility that comes with the consumption of another unit of a product or service.

Streetlights

Artificial outdoor lighting devices installed on poles, used to illuminate streets and public areas during the night for safety and convenience.

Marginal Benefit

The increment in pleasure or usefulness experienced from consuming or creating an additional unit of a good or service.