The __________________ system takes air into the body and removes air from the body.

Living things on land and in water need _________ to stay alive.

The process by which air enters and leaves our bodies is known as ___________

The ________ in the nostrils help to remove the dirt and dust that is in the air.

Blood that goes from lungs to the heart has ________ oxygen.

Blood that goes from heart to the other parts of the body has _________ oxygen.

Blood that goes from other parts of the body back to the heart has ____________ carbon dioxide and less oxygen.

Blood that goes from heart back to the lungs has _______ carbon dioxide and less oxygen.

Water vapour is also released into the surrounding air from the leaves through the ___________.

The stomata will ________ when there is less light or when the weather is too hot.

The tiny openings on the leaves are known as ______________.

During photosynthesis, the leaves take in __________________ and give out oxygen.

The _________ is a muscular organ that is about the size of our fist.

Heart _________ blood to various parts of the body.

The __________ rate is the number of times the heart beats per minute.

Blood vessels transport __________ from the heart to all parts of the body and from other parts of the body back to the heart.

Blood ________ in oxygen flows from the lungs to the heart and is then pumped to all parts of the body.

__________ is digested by the digestive system.

Both plant transport system and the human circulatory system have ________.

Exercise ________________ our heart rate and breathing rate.

For the fish _________ absorbs oxygen in the water and releases carbon dioxide.