Question

read the text.
the octopus is one of the strangest creatures in the sea. for one thing, it has three hearts. one heart pumps blood to its organs, and the other two pump blood to its gills. octopus blood itself is strange: while the blood of mammals is iron - based, an octopuss blood is copper - based. in chilly ocean depths, it turns out, copper distributes oxygen more efficiently than iron. in octopuses (yes, the plural \octopuses\ is correct), the copper substance that binds to oxygen is called hemocyanin, and it makes octopus blood appear blue.
the octopus is also highly intelligent—possibly the worlds most intelligent invertebrate, in fact. (invertebrates are animals that lack backbones.) thanks to its large brain, an octopus can solve problems, dismantle things, and navigate mazes.
which authors purpose is suggested by the text?
to inform readers about octopuses
to convince readers that octopuses are strange
to inform readers about copper - based blood

Explanation:

The text provides information about various aspects of octopuses, such as their hearts, blood, and intelligence. It doesn't just focus on one specific detail like copper - based blood (though that's part of the info about octopuses) or only try to convince that they are strange (it gives multiple facts). It's mainly presenting facts to inform about octopuses.

Answer:

to inform readers about octopuses