The answer would be C, the kidneys remove UREA from blood to produce urine, which is stored in the bladder temporarily. Hope this helps!
Answer:
it will have taken hundreds of scientists many years to build and improve; ... is just an extension of weather forecasting, but focusing on changes over ... It remains one of the great mathematical challenges
Explanation:
Because it allows only certain substances to permeate. If it was totally permeable that would be good enough to having no barrier as it would let everything though. Totally impermeable means that nothing would get through.
B. Brain and spinal cord
The nervous system is an organ system in charge of sending messages to and from the brain<span> and </span>spinal cord<span> to and from all parts of the body. </span>
Answer:
Diffusion
Explanation:
Diffusion is the process through which molecules in the cell are kept in balance with those outside the cell.
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration.
Through the above mechanism, molecules having higher concentration in the cell move out of the cell and vice versa thereby maintaining the balance of molecules in and outside the cell.
