What mechanism prevents or slows some chemicals from entering the brain, while allowing others to enter?

Consider the classification levels of a human. eukarya ,animalia ,chordata ,mammalia ,primates, hominidae ,homo ,sapiens .which is the most specific taxonomic level in the classification system above? a sapiens b homo c hominidae d primates

What are examples of the plant life and animal life that can be found in each type of terrarium

The fluid mosaic model of the membrane proposed that membranes