Many terrestrial arthropods accomplish gas exchange through tracheae, which

Many terrestrial arthropods accomplish gas exchange through tracheae, the type of mechanism is an open circulatory system.  Arthropods (including insects, crustaceans, and most mollusks) have an open circulatory system.In an open circulatory system, the blood is not enclosed in the blood vessels, but is pumped into a cavity called a hemocoel.

The coordinate plane where the point is 1 unit to the left and 3.5 units down

Step-by-step explanation:

On a coordinate plane the negative side is left and down and positive is up and right so you can eliminate any answer with up or right. The point says its (-1,-3.5) which means it will be 1 to the left making it -1 and 3.5 down which will make it -3.5.