A narra and a kapok tree need the same limited sunlight in a Philippine forest. Which interaction occurs?

An animal catches, kills, and eats an insect. Which interaction is shown?

What term describes a close, long-term interaction between organisms of different species?

A bee gets nectar while transferring pollen between flowers. How is this interaction classified?

An orchid uses a tree branch for support without helping or harming the tree. Which relationship does this illustrate?

A mosquito takes blood from a person's hand, leaving an itchy bite. Which interaction is shown?

Use the food web. Which organism eats another animal and is also eaten by another animal?

What do arrows in a food web show?

A cow and goat share a pasture. Which observation best shows competition for food rather than simply living in the same place?

Nearby trees have roots spreading through the same soil. Which resources can those roots seek?

Hunters of grazing animals decline while other conditions stay unchanged and food remains plentiful. What is most likely to happen?

A tick feeds while attached to a dog's skin. Which term describes it?

Which term describes a tapeworm living in a dog's intestine?

An egret eats ticks from a carabao's skin. Which organisms gain from this interaction?

Which observation would change a remora-shark association from commensalism to mutualism?

An introduced fish leaves less food for native fish. Why should people avoid moving it into nearby rivers?

A janitor fish eats algae and other organic material. Which role fits it?

Students use clothespins to pick up beads representing live animals in a feeding model. Which organisms do the clothespins represent?

Which change is most likely to make rivalry for grass stronger in a pasture?

Two maya birds try to claim one nesting hole. Which interaction explains their behavior?