Presentation on theme: "Interactions Among Living Things A 7 th Grade science presentation."— Presentation transcript:
Interactions Among Living Things A 7 th Grade science presentation
Interactions There are three major interactions among organisms: Competition Predation Symbiosis
Predation PPredation is an interaction in which one organism kills and eats another organism. TThe organism that does the killing is the predator. TThe organism that is killed is the prey. PPredation can have a major effect on the size of a population.
Competition CCompetition is the struggle between organisms to survive in a habitat with limited resources.
Symbiosis Symbiosis is a close relationship between two species that benefits at least one of the species There are three types of symbiotic relationships: Mutualism Commensalism Parasitism
Mutualism mmutualism is an interaction between two or more species where both species derive benefit. AAnt-aphid mutualism: the aphids are protected from predators by the ants. The ants get the aphid secretion of honeydew as a reward.
Commensalism Commensalism—is a relationship in which one species benefits and the other species is neither helped nor harmed. The Remora fish (Echeneidea) is a long slender fish which has its dorsal fin modified as a sucker-like attachment organ. It attaches to the sides of larger fish and turtles using them as transport hosts but in addition, obtains food fragments dropped from the host.
An organism living on or inside another organism and harming it. Head lice Ticks Fleas Heart worm Parasitism