Use the following to answer questions: 
-(Table: Three Tax Structure Proposals) Look at the table Three Tax Structure Proposals. A regressive tax structure can be found in:
Definitions:
Neurotransmitters
Chemical messengers that transmit signals across a chemical synapse, from one neuron (nerve cell) to another target neuron, muscle cell, or gland cell.
Hypothalamus
A region of the brain that regulates various bodily functions including hunger, thirst, sleep, and hormonal secretions.
Testosterone
A steroid hormone primarily produced in the male testes and female ovaries, associated with the development of secondary sexual characteristics and influencing behavior.
Aggression
A range of behaviors that can result in both physical and psychological harm to oneself, others, or objects in the environment.
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