Answer:
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Silicon is the second most abundant element in the Earth´s crust and makes up around 27% of it.
Active, Dormant, and Extinct.
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An example of an external stimulus is a decrease in oxygen levels in the blood during exercise.
Option C
<h3>What is stimulus?</h3>
A stimulus is defined as a thing or sensation that causes a specific reaction in an organ or tissue of a living organism
There are two types of stimuli:
- Internal stimulus
- External stimulus
Learn more about stimulus:
brainly.com/question/20117556
