<span>The answer is a certain required chemicals must be actively
transported. Blood brain barrier is a
selective membrane that separates blood circulating from the brain and the
fluid of extracellular in the central nervous system. This is also called a
filtering mechanism, the capillaries that carry blood to the brain and spinal
cord tissue blocking the path way of the certain substance.</span>
Out of all the choises
a. cells are the building blocks of life
b. cells all arise from pre existing cells
<span>c. cells are the basic living units of structure an function </span>
<span>d. all of above
</span>it would be d
It is very dark down there, it is so deep that it makes it hard for scientists to be able to survive down there, & there is not really any ready to use equipment since we don't know how it is down there.
Explanation:
bro I am not able to join the meeting on Monday and Monday will be 1 to the right time to get it