Many harsh chemicals like baby powder(which some adults use), deodorants, harsh chemicals in lotions and spray on colognes. Different things that are bad for your skin but many adults use everyday. <span />
Answer:
Membrane transport is essential for cellular life. As cells proceed through their life cycle, a vast amount of exchange is necessary to maintain function.
Explanation:
Well yes, but a dichotomous key can be used to classify just about anything you want.
Hope that helped
