Understanding types of symbiosis Interspecific interactions can be categorized by whether each species in the interaction benefits, is harmed, or is neither helped nor harmed. Competition is a -/- interaction, meaning that it has a negative effect on both species. Mutualism, parasitism, and commensalism are types of interspecific interactions in which at least one species benefits. Three examples of symbiosis are epiphytic orchids and trees, hookworms and humans, and bees and flowers. Epiphytic orchids are plants that live on the branches or trunks of trees. The trees supply the orchids with space, and the orchids (which are autotrophs) do not appear to affect the tree. Human hookworms live in human intestines and eat blood. Bees pollinate flowers while gathering nectar. Categorize mutualism, parasitism, and commensalism as either +/-, +/0, or +/+. Also select the correct definition and example for each interaction. Drag the labels to their appropriate locations on the table: 1) Parasitism 2) Mutualism 3) Commensalism Match with the appropriate line? a) +/- Interaction b) +/0 Interaction c) +/+ Interaction 1) One species benefits; the other is unaffected 2) Both species benefits 3) One species benefits by harming another Match with the appropriate line? a) +/- Interaction b) +/0 Interaction c) +/+ Interaction 1) hookworms and human 2) bees and flowers 3) epiphytic orchids and trees Match with the appropriate line? a) +/- Interaction b) +/0 Interaction c) +/+ Interaction
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