Answer:
B
Explanation:
Stratosphere,absorbs rays of damaging ultraviolet light from the sun
Answer:
it is a catecholamine that stimulates alpha1 adrenergic receptors and, slightly, beta1 adrenergic receptors, without beta2 effect. It is the vasoconstrictor drug par excellence.
It will be better for the population
Answer: I would go with B. Here’s why: An index fossil is usually easily recognizable, and underwent a wide geographic distribution. What leads me to believe B is the correct answer, is because it’s something that existed “ all over the world”.
B. is a protective structure made of cellulose fibrils
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