Natural barriers include the skin, mucous membranes, tears, earwax, mucus, and stomach acid.
Answer:
The correct answer is option ( A )
Explanation:
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It would take 18 days, because it takes 3,500 calories to gain a pound, 3500/200 is 17.5, round that up to 18.
Learning by doing exercises or playing games; commonly used in schools.
Answer:
Turn off the lights of any room you're not in
Use energy saving bulbs
Explanation:
