Depending on what you're using the word for- you can say a drug is a medication, or you can say it's an illegal substance
Answer:
A. The dermis lies anterior to the epidermis.
Explanation:
The "Skin" consists of <u><em>three layers:</em></u>
<em>1. Epidermis</em>
<em>2. Dermis</em>
<em>3. Subcutaneous Fat</em>
They are arranged accordingly, which means that the "dermis" lies beneath the epidermis. Therefore, it lies "posterior" or <em>at the back of the epidermis</em>. "Anterior" means<em> "front."</em> The dermis is definitely not anterior to the epidermis. <u>This makes choice A as not a characteristic of the dermis.</u>
<em>Choice B is a characteristic of dermis</em> because the dermis consists of<u> many blood vessels</u> and<u> three types of connective tissue</u><u><em>s</em></u><em> (collagen fibers, elastic fibers and reticular fibers). </em>
<em>Choice C is a characteristic of dermis </em>because it also consists of the<u> lymph vessels, nerves and accessory organs.</u>
<em>Choice D is a characteristic of dermis</em> because the dermis consists of two distinct layers, a superficial layer <em>(papillary dermis</em>) and a deeper layer <em>(reticular dermis). </em>
Variable ratio
Among the reinforcement schedules, variable ratio is the most productive and the most resistant to extinction. Fixed interval is the least productive and the easiest to extinguish (Figure 1).
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