1. Relationships among Populations

2. Before watching the video, take time to read over all the questions in the activity page Before watching the video, take time to read over all the questions in the activity page While watching the video, fill in the answers to your activity sheet While watching the video, fill in the answers to your activity sheet Video- http://player.discoveryeducation.com/index.cf m?guidAssetId=9442E194-317A-4EFD-8410- 2392E05F2A25&blnFromSearch=1&productco de=US Video- http://player.discoveryeducation.com/index.cf m?guidAssetId=9442E194-317A-4EFD-8410- 2392E05F2A25&blnFromSearch=1&productco de=US http://player.discoveryeducation.com/index.cf m?guidAssetId=9442E194-317A-4EFD-8410- 2392E05F2A25&blnFromSearch=1&productco de=US http://player.discoveryeducation.com/index.cf m?guidAssetId=9442E194-317A-4EFD-8410- 2392E05F2A25&blnFromSearch=1&productco de=US

3. With the people at your table discuss the answers to the Activity Sheet With the people at your table discuss the answers to the Activity Sheet

4. Intraspecific Competition: When members of the same species compete for resources Intraspecific Competition: When members of the same species compete for resources Interspecific Competition: When members of different species compete for resources Interspecific Competition: When members of different species compete for resources When organisms compete for resources they limit the growth of a population When organisms compete for resources they limit the growth of a population Predation: An interaction where one organism kills and hunts another organism Predation: An interaction where one organism kills and hunts another organism Predation affects population size by decreasing the prey population. Predation affects population size by decreasing the prey population. Predators adapt to catch their prey by avoiding prey that may be distasteful or poisonous Predators adapt to catch their prey by avoiding prey that may be distasteful or poisonous Organisms adapt to avoid becoming prey through color patterns, having bright colors to warn predators of their poisonous nature or mimic colors of poisonous organisms Organisms adapt to avoid becoming prey through color patterns, having bright colors to warn predators of their poisonous nature or mimic colors of poisonous organisms

5. Symbiosis: a relationship in which two organisms of different species live in close association and at least one organism benefits Symbiosis: a relationship in which two organisms of different species live in close association and at least one organism benefits Parasitism: a symbiotic relationship where the parasite benefits from the host by using some of its energy. This relationship may or may not kill the organism Parasitism: a symbiotic relationship where the parasite benefits from the host by using some of its energy. This relationship may or may not kill the organism Mutualism: a symbiotic relationship where both organisms benefit from the relationship Mutualism: a symbiotic relationship where both organisms benefit from the relationship Being mutually beneficial can lead to interdependency because on cannot survive without the other. Ex. Being mutually beneficial can lead to interdependency because on cannot survive without the other. Ex. Commensalism: a symbiotic relationship where one organism benefits and the other is not affected Commensalism: a symbiotic relationship where one organism benefits and the other is not affected

6. Interactions Species 1 Species 2 Competition Organism 1 Negative Organism 2 Negative Predation PredatorPositivePreyNegative Parasitism ParasitePositiveHostNegative Mutualism Organism 1 Positive Organism 2 Positive Commensalism Commensal Organism Positive Organism 2 Neutral