Which Animal Phylum Lacks a Network of Nerve Cells for Gathering

question 26

Multiple Choice

Which animal phylum lacks a network of nerve cells for gathering information from the environment?

• A)Porifera - sponges
• B)Cnidaria - jellyfish,sea anemones
• C)Platyhelminthes -- flatworms
• D)Nematoda - roundworms
• E)Mollusca - octopus,squid,clams,snails,and other mollusks

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Definitions:

Resource Cost

The cost associated with the consumption or use of resources, including materials, labor, and capital in the production of goods and services.

Output

The amount of products or services produced by a company, industry, or economy in a specified period.

Labor Demand Curve

A graphical representation showing the relationship between the wage rate and the quantity of labor employers are willing to hire.

Diminishing Returns

A principle stating that if one input in the production of a commodity is increased while other inputs are held fixed, a point will eventually be reached at which additions of the input yield progressively smaller, or diminishing, increases in output.