Two Species of Three-Spined Stickleback Fish Live in a Single

question 24

True/False

Two species of three-spined stickleback fish live in a single lake in British Columbia.They are closely related but occupy different niches.They exist nowhere else.These species most likely arose by sympatric speciation from a single species of three-spined stickleback.

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Definitions:

Calcitonin

A hormone produced by the thyroid gland that helps regulate calcium levels in the blood by inhibiting bone resorption.

Glucagon

A substance secreted by the pancreas which increases blood sugar levels by encouraging the liver to break down glycogen and release glucose.

Uterine Contractions

The tightening and relaxing of the uterine muscles, important in childbirth and menstruation.

Oxytocin

A hormone and neurotransmitter involved in childbirth, lactation, and social bonding, produced in the hypothalamus and released by the pituitary gland.