Carbohydrates, Lipids and proteins
Answer:
Transportation of essential gases an nutrients, waste and unwanted products
Explanation:
the key feature of circulation is transportation of essential gases and nutrients around the body of an organism, removes unwanted products of metabolism from the tissues, and carries these products to specialized excretory organs, if present.
<span>Hi,
What are malignant tumors?</span><span>
Malignant tumors may develop in any part of the body.
- Malignant (or cancerous). In malignant tumors, cancer cells invade and destroy the cells that are nearby.
(The cells of malignant tumors proliferate uncontrolled <span>way).</span></span>
