Laboratory helps you identify things rather than the others using controlled variables
Explanation:
Each step in a food chain or web is called a trophic level
C. employment and unemployment
because it is the only one that makes sense
Endorphins are brain chemicals
known as neurotransmitters which are released when the body feels a certain
amount of stress and pain. Endorphins alter the communication of pain in the
body by interacting with the opiate receptors and blocking the synapse so that signals
cannot be sent to the brain in order to reduce an individual perception of pain.
Answer:
Option D.) Groundwater
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