Answer:living organisms need water to survive.
Some such as fish can breathe in water.
Others need water to break down food molecules or to get energy.
Explanation:
Answer:
The correct answer is C) Passive transport
Explanation:
During the respiration process exchange of gases takes place between lungs and blood. This gas exchange is carried by simple diffusion which is a passive transport. Here gas molecule moves from area of higher concentration to the lower concentration area.
The lung's alveoli are surrounded by blood capillaries in which the concentration of CO2 is high while in alveoli concentration or partial pressure of CO2 is low so CO2 moves from blood to alveoli through diffusion.
In the case of oxygen, the concentration of oxygen is high in alveoli and less in blood inside blood capillaries so oxygen moves from alveoli to blood by diffusion. So the right answer is C.
<span>The rate of diffusion of a substance depends on four factors which are: temperature, concentration gradients, diffusion distance and the diffusion and host material. The rate of diffusion is affected by differences in concentration gradient; the higher the difference in concentration gradient, the higher the diffusion rate. Thus, small concentration gradient will not increase the rate of diffusion. The correct option is A.</span><span />
