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You go on a canoe trip to the Boundary Waters Canoe Area (BWCA) in northern Minnesota. This ecosystem is cold most of the year and receives plenty of rainfall. It has many lakes that are full of walleye pike. You know that walleye like to eat minnows. In turn, the minnows feed on scuds (zooplankton) , which eat algae (phytoplankton) .
-Walleye pike tend to live in deep waters and feed at night.Northern pike live in shallower waters and feed all day.Which of the following best explains these differences?
Chemical Secretions
Chemical secretions refer to substances produced and released by cells or glands, which can serve various functions such as signaling, protection, or digestion.
Receptor Sites
Specific regions on the surface of a cell or within a cell where molecules such as hormones, drugs, or neurotransmitters, can bind to elicit a physiological response.
Endocrine Glands
Glands of the endocrine system that release hormones directly into the bloodstream to regulate various body functions.
Hormones
Chemical messengers that are secreted by glands in the endocrine system and travel through the bloodstream to target organs.
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