Answer the following statements true (T) or false (F)
1. In a commensal relationship between a phoretic species and its "host", the phoretic species is not affected.
2. Humans exert top-down pressures on white-tail deer.
3. Resource partitioning enables species that are better competitors to exclude similar species from a community.
4. Secondary metabolites originally meant to defend a plant can become essential compounds for some herbivores.
1. FALSE
Commensalism is an interaction between species in which one benefits and the other is neither helped nor harmed. One of the best examples of commensalism involves phoresy, in which one organism (the phoretic species) uses a second organism (the host) for transportation. For instance, hummingbird flower mites feed on the pollen of flowers and travel between flowers in the nostrils of hummingbirds. The hummingbird hosts are unaffected but the phoretic mites benefit from the behavior.
2. TRUE
3. FALSE
4. TRUE
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