Classification

question 15

Multiple Choice

Classification. Respond to the following statements in reference to the five animal phyla listed below.
-This phylum has the greatest number of species.

• A)Annelida
• B)Arthropoda
• C)Mollusca
• D)Echinodermata
• E)Cnidaria

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Definitions:

Terrestrial

Terrestrial refers to things relating to the Earth or living or growing on land as opposed to water or air.

Aquatic Environments

Natural water bodies like rivers, lakes, and oceans that are habitats for a wide range of organisms.

Gas Exchange

The biological process through which different gases (like oxygen and carbon dioxide) are transferred in opposite directions across an organism's respiratory membranes.

Pulmonary Surfactant

A complex mixture of lipids and proteins secreted by cells in the lungs, reducing surface tension and preventing the collapse of alveoli at the end of expiration.