What Is the Main Basis for Placing the Arthropods and Nematodes

question 36

Multiple Choice

What is the main basis for placing the arthropods and nematodes in the Ecdysozoa in one hypothesis of animal phylogeny?

• A)Animals in both groups are segmented.
• B)Animals in both groups undergo ecdysis.
• C)They both have radial, determinate cleavage, and their embryonic development is similar.
• D)The fossil record has revealed a common ancestor to these two phyla.
• E)Analysis of genes shows that their sequences are quite similar, and these sequences differ from those of the lophotrochozoans and deuterostomes.

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Definitions:

Accommodation

In cognitive psychology, the process of altering one's mental representations to better accommodate external realities.

Erikson's Stages

A theory proposed by Erik Erikson that outlines eight stages of psychological development, from infancy through late adulthood.

Psychosocial Development

Erik Erikson's theory that individuals go through eight stages of development, each characterized by a specific conflict that must be resolved to move to the next stage.

Ego Identity

A sense of self that develops through social interaction and becomes a centrally held set of values and beliefs that guide behavior.