I guess I would say b or d. Because concluded results change over time with better technology and some solutions dont work.
ans is D. Most items are features in the spinal cord, but the hippocampus is in the brain.
Thin, flexible barrier around a cell; regulates what enters and leaves the cell
- contains the cytoplasm (all interior cell organelles and the cytosol) - allowing the chemical reactions in the cell to occur
<span>- semipermeable (or selectively permeable) - allows certain substances in, keeps others out </span>
<span>- offers limited protection</span>
