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Oxygen moves via diffusion from the alveoli in the lungs where there is a high concentration of oxygen, into the blood where there is a low concentration of oxygen - it moves down its concentration gradie...
Dead leaves fall from plants to the ground. These leaves contain carbon. They are digested by microorganisms like bacteria which take up carbon and then respire it into the atmosphere. Plants are autotrop...
Firstly, humans have a double circulatory system, which increases blood pressure and flow of blood to the tissues. To allow the heart to pump blood around the body, the heart is made of cardiac muscle. Th...
Individuals within a species show a wide range of genetic variation. Some individuals will have characteristics more suited for their environment, meaning they are more likely to survive and reproduce. Th...
Auxin is produced in higher concentrations in the shaded side of the plant, as auxin causes the cells to elongate and grow, the shaded side cells grow and elongate more than the non shaded side which caus...
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