B, C, D, B
I hope these are right, hope this helped.
Organ. An organ is a system of tissues that work together on a larger scale to do certain jobs within an animal's body. Examples of organs are the brain, heart and lungs. Anatomy is an example of a biology specialty concerned with this level.
I think it is D hope I’m right
Answer:
All organic molecules are made up of carbon compounds so we can say that the main atom or molecule is carbon.
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