Why might females botos look for displays such as lifting large rocks as a way to choose a mate?

That is known as sexual selection

Explanation:

The greatest potential that males have to broaden their reproductive success is that in the vast majority of species they have perfected many characters that are extravagant, and are used to compete for females. This extravagance is not arbitrary, but those characters become signals in which both potential male and female competitors are interested. Sexual selection is a determining factor in several facets of the life of living beings and promotes the increase of diversity, negatively influencing the risk of extinction.

the answer is true. hope it .

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.