Humans are primary consumers
Answer: a leaf most times has a large surface area, it has this so that it can absorb more light. and the upper waxy layer on the leaf is there to prevent water loss
They left so it would be emigration. Hope that helps!
When we breathe, our respiratory system takes up oxygen and carbon dioxide or other useless gases go out . The oxygen combines with the haemoglobin in the blood of the circulatory system . This is transferred to all the cells of our body to get energy.