science

1. respiratory system

1.1. our cells need oxygen to combine with nutrients and to prodce energy .

1.1.1. The parts are the heart, veins, capillaries...

2. digestive system

2.1. Nutrients are the substance which plants and animals need in order to live and grow.Is agroup of organs that pass the food.

2.1.1. The parts are the osphagus,

3. excretory system

3.1. The excretory system eliminates waste products from our body.

3.1.1. The parts are the urethra, ureters, anus.

4. circulatory system

4.1. delivers blood to the body's tissues through network the blood vesels .

4.1.1. y