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*** Rainfall
 
*** Rainfall
 
*** Food availability.
 
*** Food availability.
* A variety of sensory receptors detect these cues, including the eye, pineal gland (an organ in the dorsal part of the forebrain that is sensitive to light), olfactory organs, taste buds, and thermoreceptors.
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* A variety of sensory receptors detect these cues, including the eye, [[Endocrine_System_-_Pineal_Gland_-_Anatomy_%26_Physiology|pineal gland]] (an organ in the dorsal part of the forebrain that is sensitive to light), olfactory organs, taste buds, and thermoreceptors.
 
* The hypothalamus, located at the base of the brain, is sensitive to signals from sensory receptors and releases gonadotropin releasing hormones (GnRH) in response to environmental cues.
 
* The hypothalamus, located at the base of the brain, is sensitive to signals from sensory receptors and releases gonadotropin releasing hormones (GnRH) in response to environmental cues.
 
* GnRH travels from the hypothalamus to the pituitary gland.  
 
* GnRH travels from the hypothalamus to the pituitary gland.  
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