Yes. Without the heart, you would die. Then, I don't think you would be able to breath. Sorry, that was a little morbid.
Yes. Air is about 80% nitrogen.
yes because the heart pumps blood to the lungs for you to breath
yes they do need the air that we breath out
yes they both do but mostly fish use gills.
Mold (fungi in general) require oxygen to grow, but they do not breath in the sense that you and I breath.
Yes, heart palpitations and shortness of breath can be signs of brainstem compression. These symptoms can be caused by other conditions, including heart disease and respiratory conditions. If you are experiencing these symptoms, check with your doctor.
yes
First there are no such things as blood witches. Second yes witches do have to breath we are human.
yes, he or she may need a little help but will be able to breath
yes penguins do need air to breath underwater.
Yes, you would breathe mostly through your mouth, but you can breathe through your nose with you tongue sticking out of your mouth.
yes because they are a type of plant and plants need to breath.