Spiral Cleavage in Early Development

question 97

Multiple Choice

Spiral cleavage in early development

• A) is a synapomorphic trait in lophotrochozoans.
• B) is a good trait to use for establishing evolutionary relationships among organisms.
• C) occurs only in worm-like groups of lophotrochozoans.
• D) occurs in mollusks.
• E) always results in adult organisms that have similar body plans.

---

Definitions:

Predetermined Overhead Rate

An estimated rate used to assign manufacturing overhead costs to products based on a certain activity (e.g., machine hours).

Variable Manufacturing Overhead

Costs of manufacturing that fluctuate with the level of production output, such as utility costs directly tied to machine operation.

Machine-Hours

A gauge for the level of production or activity, calculated through the duration machines are in use.

Manufacturing Overhead

Indirect costs related to manufacturing that are not directly tied to specific units produced, such as maintenance and utilities.