Question

question 11 of 17
the bullhorn acacia grows special tissues in which ants live. the ants find a safe place to live and attack any animals that attempt to graze on the acacia.
the leucochloridium worm infects snails and is able to control the snails behavior, creating a zombie - like snail. the worm forces the snail to attract predators to itself so that the worm is eaten and passed to its next host.
on the galapagos islands, there are finches that remove parasitic insects from tortoises. the finches gain a meal and the tortoises are ridded of parasites.
cattle egrets follow cattle and other large grazing animals and eat the insects stirred up by cattles hooves.
commensalism mutualism parasitism
answer bank
hermit crab and snail galapagos tortoise and finches ticks and humans bullhorn acacia and ants leucochloridium worm and snail

Explanation:

Commensalism is a relationship where one organism benefits and the other is neither helped nor harmed. Mutualism is when both organisms benefit. Parasitism is when one organism (parasite) benefits at the expense of the other (host). Hermit crab and snail - commensalism as hermit crab uses snail's shell without harming or helping the snail. Galapagos tortoises and finches - mutualism as finches get food and tortoises get rid of parasites. Ticks and humans - parasitism as ticks feed on human blood harming humans. Bullhorn acacia and ants - mutualism as ants get a home and ants protect acacia. Leucochloridium worm and snail - parasitism as worm controls and harms the snail.

Answer:

Commensalism: hermit crab and snail
Mutualism: Galapagos tortoises and finches, bullhorn acacia and ants
Parasitism: ticks and humans, Leucochloridium worm and snail