Examlex
Explain why primary ecological succession usually takes hundreds or thousands of years, while secondary ecological succession can occur much more quickly.
Barbiturates
A class of drugs that act as central nervous system depressants, used as sedatives or sleeping pills but can be addictive.
Amphetamines
Amphetamines are a class of stimulant drugs that increase central nervous system activity, leading to heightened alertness, attention, and energy.
Barbiturates
A class of drugs that are used as sedatives and hypnotics, they can be highly addictive and have been largely replaced by safer alternatives.
Opiates
Opium and its derivatives, such as morphine and heroin; they depress neural activity, temporarily lessening pain and anxiety.
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