The First Animals with Simple Nerve Nets Probably Evolved About

question 83

Multiple Choice

 The first animals with simple nerve nets probably evolved about _________ years ago.

• A) 4.5 billion
• B) 3.5 billion
• C) 700 million
• D) 250 million

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Definitions:

Dreaming

The experience of envisioned images, sounds, or other sensations during sleep, often narrative in nature and involving elements from waking life.

Muscles

Tissues in the body that have the ability to contract, enabling movement of different parts of the body.

Sigmund Freud

An Austrian neurologist known as the founding father of psychoanalysis, a method for treating psychopathology.

Unconscious

A part of the mind that is inaccessible to the conscious mind but that affects behaviors and emotions.