<span>They are derivatives of hydrocarbons.</span>
Answer:
coal
Explanation:
As coal is used in a huge amount in the present world
mostly in developing country
it is expected to be extinct or finished soon from the earth
so it need to be used wisely
Synovial joints and muscular system
Answer:
Cells contain DNA that controls the production of proteins.
Explanation:
The answer would be C. Chloroplasts. Chloroplasts are only found in plant cells because they create their own food. Chloroplasts are used during the process of photosynthesis which is not done by human fingernails.
Hope this helps!
~Starr