National Geographic education. ACTIVITY: Marine food webs.

ACTIVITIES. Ecological relatonships.Convergent evolution. Energy sources.Impacts.Vertebrate classification. National Geographic.

Students will:

• describe possible ecological relationships between species that live in close proximity to each other
• define symbiotic relationships as mutualistic, parasitic, or commensalistic
• classify symbiotic relationships

http://education.nationalgeographic.com/education/activity/ecological-relationships/?ar_a=1

National Geographic Education. Encyclopedia.

http://education.nationalgeographic.com/education/encyclopedia/?ar_a=1