This would be called--Visual.
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Biological structures like DNA, proteins and cells all depend on molecules. ... Neurotransmitters like epinephrine are pretty simple molecules, but without them our nervous system couldn't work. Oxygen, containing just two oxygen atoms, is a very simple molecule, and it is certainly essential to living things.
Stressor due it comes from an external condition or event.
Answer:
insulin/glucose/liver/pancreas
They can create competition within a certain niche
