The Classification System Is Always Evolving as Scientists Continuously Question

question 42

True/False

The classification system is always evolving as scientists continuously question the organization and placement of organisms.

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Definitions:

Hormones

Chemical substances, released from endocrine glands, that travel through the bloodstream to targeted tissues; the tissues are later influenced by the hormones.

Gonads

Sex glands responsible for producing gametes (sperm in males and eggs in females) and sex hormones.

Secondary Sex Characteristics

Physical changes during puberty that are not directly related to reproduction but that indicate the differences between the sexes.

Endocrine System

A communication system that uses hormones to influence mental activity and behavior.