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 convince readers that octopuses are strange
to inform readers about octopuses
to inform readers about copper - based blood

Explanation:

The text presents various facts about octopuses such as their number of hearts, blood - type, and intelligence. It doesn't aim to convince but rather to give information. While it mentions copper - based blood, it's part of the overall information about octopuses.

Answer:

to inform readers about octopuses