Select the correct statement. a) some drugs readily pass through the skin. b) drugs taken by inhalation are usually slower acting and less potent than drugs taken orally. c) usually more drug is needed when given intravenously than when administered orally to achieve an effect. d) the more times a drug is injected in the same vein, the easier the injection becomes.

a) Some drugs readily pass through the skin.

Explanation:

The skin has the ability to absorb various substances. Some penetrate the most superficial layers and others the deepest of the organ and may even enter the bloodstream. Penetration of mediations, for example, is not always possible because of natural barriers - such as the stratum corneum (the outermost layer of the skin, composed of keratin). However, some medications pass quickly through the skin.

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs