<p><span style="font-size: 16px;">In more advanced animals, the senses are constantly at work, making the animal aware of stimuli—such as light, or sound, or the presence of a chemical substance in the external environment—and monitoring information about the organism’s internal environment. All bilaterally symmetric animals have a sensory system, and the development of any species’ sensory system has been driven by natural selection; thus, sensory systems differ among species according to the demands of their environments. The shark, unlike most fish predators, is electrosensitive—that is, sensitive to electrical fields produced by other animals in its environment. While it is helpful to this underwater predator, electrosensitivity is a sense not found in most land animals.</span></p> <p><span style="font-size: 16px;"><span id="fs-idm104438816" style="box-sizing: border-box; display: block; margin: 0px; text-align: center; color: #555555; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; line-height: 20px;" data-type="media" data-alt="Photo shows a shark swimming toward the camera."><img src="http://cnx.org/resources/13db7a8945d17ff83e2e1221d9478b6f5821cf6e/Figure_36_00_01.jpg" alt="Photo shows a shark swimming toward the camera." width="600" style="box-sizing: border-box; vertical-align: middle; max-width: 100%;" data-media-type="image/jpg" /></span>This shark uses its senses of sight, vibration (lateral-line system), and smell to hunt, but it also relies on its ability to sense the electric fields of prey, a sense not present in most land animals. (credit: modification of work by Hermanus Backpackers Hostel, South Africa)</span></p> <p><span style="font-size: 16px;"></span></p> <p style="margin: 1em 0px; padding: 0px; outline: 0px; word-wrap: normal; line-height: 16.8px; word-break: normal;"><strong style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal; font-size: 16px; line-height: 1.4;">Complete the tasks on the list below:</span></strong></p> <p><span style="font-size: 16px;"></span></p> <ul style="outline: 0px; word-wrap: normal; word-break: normal; line-height: 16.8px;"> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal; font-size: 16px; line-height: 1.4;">Go to this page,<a href="http://cnx.org/contents/GFy_h8cu@10.53:6fl-DRCu@6/Sensory-Processes">http://cnx.org/contents/GFy_h8cu@10.53:6fl-DRCu@6/Sensory-Processes</a>, on the left you will see a menu, read the following pages for the Sensory Systems:</span></li> <ul> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="font-size: 16px;"><a href="http://cnx.org/contents/GFy_h8cu@10.53:6fl-DRCu@6/Sensory-Processes">Sensory Processes</a></span></li> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="font-size: 16px;"><a href="http://cnx.org/contents/GFy_h8cu@10.53:5nOdwC6i@5/Taste-and-Smell">Taste and Smell</a></span></li> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="font-size: 16px;"><a href="http://cnx.org/contents/GFy_h8cu@10.53:RflAUPE2@6/Hearing-and-Vestibular-Sensati">Hearing and Vestibular Sensations</a></span></li> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="font-size: 16px;"><a href="http://cnx.org/contents/GFy_h8cu@10.53:fvwAeW4E@6/Vision">Vision</a></span></li> </ul> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal; font-size: 16px;">Use the QR codes on the pages to review and get visual aids for the concepts that are being presented</span></li> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal; font-size: 16px; line-height: 16.8px;">Use the Glossary at the bottom of the page to help with the vocabulary for this week</span></li> <li style="margin: 0px; outline: 0px; word-wrap: normal; word-break: normal;"><span style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal; font-size: 16px;">Use the Review Questions and Free Response questions to check for understanding</span></li> </ul> <p><span style="font-size: 16px;"></span></p> <p style="margin: 1em 0px 0px; padding: 0px; outline: 0px; word-wrap: normal; line-height: 16.8px; word-break: normal; text-align: right;"><span style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal; font-size: 16px;"><span style="margin: 0px; padding: 0px; outline: 0px; word-wrap: normal; word-break: normal; font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; font-size: 14px; line-height: 20px;">Download for free at <a class="sExtlink-processed" style="margin: 0px; padding: 0px; outline-width: 0px; word-wrap: normal; color: #3a549a; word-break: normal;" href="http://cnx.org/contents/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.53">http://cnx.org/contents/185cbf87-c72e-48f5-b51e-f14f21b5eabd@10.53</a></span></span></p> <p><span style="font-size: 16px;"></span></p>