<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>
Be there for them and let them know they're not alone.
The answer is B. Uneven rock layer.
Uneven rock layer can directly lead to nonconformity on an exposed rock. Usually the rocks are layered evenly. When the rocks are uneven it will be exposed and show different kind of rocks.
Two individual flatworms must transfer sperm to each other
The answer to the question stated above is: letter C.Traits acquired during a lifetime are not passed on to offspring.
>Lamark had doubts too. He cited the animal's neck as an example. He said that animal's neck<span> could get a bit longer when its owner often stretched it, trying to reach higher leaves in the trees for example. But, t</span>hat's actually not stretching. The truth was too far beyond belief.
However, merely because a physical change has been achieved by an individual, it doesn't mean that those changes can be inherited by their descendants.
