Without staining them you wouldn't be able to see them
It's C.
All chemical reactions will always need activation energy.
<span>I think this is partly true and partly false. It is partly true because plants undergo in a process called photosynthesis and it is sunlight that makes them do this. It is partly not true because literally the sunlight can't be considered a food source because it actually don't give you food.</span>
Adrenaline, Cortisol, Norepinephrine.
<span>involuntary responses are part of the autonomic system
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