The circulatory system and the respiratory system work together to exchange
oxygen and carbon dioxide in the lungs.
true
false

True

Explanation:

The respiratory system get air while the circulatory system  takes that air spreads it to all of the cells

True!

Explanation:

The circulatory system helps to pump blood throughout the body. This is important because red blood cells work to carry oxygen throughout the body. The respiratory system is what allows us to breathe in this oxygen that is later absorbed by red blood cells. The respiratory system also extracts carbon dioxide from the blood which we later breathe out.

not sure if this is what you'r looking for eubacteria and archaebacteria

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.