Answer:
Well some people don't get enough sunlight during winter and some don't drink enough orange juice. Others might have a disorder where their body doesn't produce enough vitamin d
Explanation:
Sit ups is probably the correct answer
Find a new hobby to start and maybe do a self transformation and create a new image of yourself. Try to always think of the positive things in your life
The answer to your question is,
Differentiate between similar tissues.
-Mabel <3
