The tundra is broken up into 2 parts. What are these 2 parts?

Which of the following are responsible for sending messages from the hypothalamus to the thalamus?

Organize the following objects from lowest volume to highest volume

When is your breathing likely to speed up? a. when your white blood cells increase b. when your cells need more energy c. when your heart cells need more carbon dioxide d. when your blood cells have too much oxygen