Which of the following describes a function of cerebrospinal fluid?
1. Maintain optimum ionic environment
2. Maintain pH homeostasis
3. Provide circulation for exchange of nutrients/wastes
4. Serve as a shock absorbing fluid system of spinal cord
5. Provide buoyancy of the brain

What feature of cell theory is best demonstrated in the image

Read the following scenario to answer the following question. in some zoos, rare crosses between a male lion and a female tiger have produced hybrid offspring called "ligers." male ligers are sterile but some female ligers are fertile. in the wild, lion and tiger ranges do not naturally overlap, making such a cross unlikely. furthermore, the solitary behavior of tigers and the social organizations of lions create behavioral differences. applying the biological species concept, the sterility of ligers reveals that a. lions are probably a subspecies of tigers b. tigers and lions are the same species c. a new species called "ligers" is forming d. tigers and lions are separate species

Quick asap will give brainiest ! what best describes the same pattern of tides on earth throughout the day? neap tides spring tides semidiurnal tides nocturnal tides