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You can measure humidity in your back yard with a wet/dry bulb thermometer (it takes practice to use this, and some math skills). You have to wet the bulb of one thermometer and leave the other one dry.

Explanation:

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desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

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