Which example illustrates commensalism and not mutualism?
a
hippo dung is eaten by a large species of catfish native to african lakes. the catfish typically follow the hippo herds.
b
cattle have protozoa living in their gut that digest cellulose. the cows are able to feed on grass, while the protozoa are sheltered inside the cow.
c
oxpeckers remove parasitic fly larvae from the skin of buffalo. in exchange, they are protected from predatory cats, who will not challenge a buffalo.
d
ants 'farm' aphid insects like cattle. aphids suck the sap out of trees, which ants also feed on. in turn, the ants sting predators that attack the aphids.

What evidence could be used to convince policy makers to change a shipping lane from going through a whale breeding ground? information on the number of all whale species currently alive information on the number of all whales hit by boats in the given area information on the number of whale deaths in the world's oceans information on the number of whale offspring born every year. (a) scientists could collect and combine data on fish populations all around the world to show that their populations are declining. (b) scientists collect and combine data on fish populations all around the world to show that their populations are increasing. (c) scientists work together and use past data to show that fish populations are becoming locally extinct in some areas. (d) scientists work together and use past data to show that some fish populations are adapting to environmental changes.