The circulatory system takes the carbon dioxide from the cells to the lungs and the respiratory system expels ir.
Its A, blood circulates the hormones
Answer:
meteorite striking the dinosaures
The advantage of natural breeding are the following:
1. cattle produce may eradicated hereditary sickness.
2. the cattle that is produce is fitter, stronger and can survive through harsh condition because they are use to it.
3. they can produce better food
The growth of plants and formation of land mammals characterized the paleozoic era.
