A tick attaches to and sucks blood from a dog, and the dog weakens.

A remora fish attaches to a shark and eats any leftover food, but it doesn't bother the shark.

Two male lions fight over a female for mating.

Hummingbirds move from flower to flower in search of nectar, and the plant is pollinated.

Spores of the fungus Ustilago maydis land and grow on sweet corn. The fungus then infects the plant tissue, extracting nutrients from the plant's cells.

The relationship between sweet corn and Ustilago maydis can best be described as -

In mutualism, both organisms are _____________ from the relationship

In commensalism, one organism ____________ and the other is ___________ about the relationship

In parasitism, one organism _______________ and the other is _________________

What is the importance of symbiosis relationships for the ecosystem?