<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>
#1 is D) uniformitarianism
Answer:
depending on certain variables... you could create a laser
Each of the 3 type of finch consume different food sources. if two of the food sources are gone, the other two finch’s won’t be able to eat and survive. the entire population of these 2 types may become extinct; only the last specie will survive.
in conclusion, the finch population will decrease.
hope this helps!
Three weeks is how long a human can live without food