Match each protein with the correct label in Figure 20-1. 
Figure 20-1
-actin
Definitions:
Pheromone
A chemical substance produced and released into the environment by an animal, especially an insect, affecting the behavior or physiology of others of its species.
Social Behavior
Actions conducted by individuals that are influenced by or aimed at other members of the same species, often referring to human interactions.
Chemical
A substance with a distinct molecular composition that is produced by or used in a chemical process.
Absolute Sensory Threshold
The minimum intensity of a stimulus that one can perceive, marking the boundary between detectable and undetectable levels of sensory input.
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