Warm-Up (2/25) On the piece of white paper from the back, answer the following question. Name Date Period Explain, either verbally or visually, how light activating a light-sensing neuron in the eye stimulates adrenaline release when a person sees a bear.

3E.1a: Organisms exchange information with each other in response to internal changes and external cues, which can change behavior. Illustrative example: fight-or-flight response 3E.1b: Communication occurs through various mechanisms. 3E.1b.1: Living systems have a variety of signal behaviors or cues that produce changes in the behavior of other organisms and can result in differential reproductive success. Illustrative example: territorial marking in mammals 3E.1b.2: Animals use visual, audible, tactile, electrical and chemical signals to indicate dominance, find food, establish territory and ensure reproductive success. Illustrative example: colony and swarming behavior in insects

Organism Communication Organisms exchange information using signals. Signals lead to internal responses.

Organism Communication Will not have the territory to raise pups The ability to signal to other organisms results in differential reproductive success. Example: marking territory provides exclusive breeding grounds Will have the territory to raise pups

Organism Communication The ability to signal to other organisms results in differential reproductive success. Example: marking territory provides exclusive breeding grounds

Organism Communication Signals can be: visual audible tactile electrical chemical

Critical Thinking Question #1 CTQ #1: In an experiment, ecologists collected urine samples of regions visited by male white-tail deer during mating season. In addition, the scientists observed the number of male deer which visited the regions in a given time frame. The average results are plotted below. Explain why the concentration of male deer decreased as concentration of urine increased, and state why the number stayed constant after 250 L/acre. (LO 3.40)

Critical Thinking Question #2 CTQ #2: Create a representation to show how a single bee can promote swarming behavior in other bees. Indicate how the bee can adjust the intensity of swarming behavior (for example, two before-and-after models). (LO 3.41)

Closure Describe THREE ways by which organisms exchange information. On the piece of white paper from the back, answer the following question: Name Date Period Describe THREE ways by which organisms exchange information. Scale 1 – 10