Abird builds it's nest on a tree branch. this relationship between the bird and the tree is an example of? a. competition b. commensalism c. mutualism d. parasitism

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

Which best describes a rhinovirus? o a. a virus that causes a common cold o b. a protective shell around a virus o c. a tube the comes off a virus o d. a piece of dna transferred by a virus

Ausable water source is one that can be used by humans for drinking or agriculture. identify the water reservoirs as usable or unusable based on their current state. oceans rivers glaciers freshwater lakes groundwater