The word in the blank should be 'segregation' :)
Positron Emission Tomography scan of the brain of cocaine addicts showed that the drug affects how the brain use glucose. Cocaine users' brain cannot use glucose efficiently and there are also reduced metabolic activity in other areas of the brain.
To maintain pressure within plant cells and keep structure while growth ensues. Good luck, milady. *Tips his fedora*
Individual, population, community, biome, ecosystem
