Why are authoritarian and totalitarian systems considered unlimited governments? A) Those systems protect individual freedoms.
B) The government leaders have absolute power.
C) Those systems have one branch that checks the powers of the other branches.
D) The people under those systems are allowed to elect their government leaders.

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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check for the pregnancy rating of drug. if its class c or d see if other alternatives

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products