Explain why scientists think the first life on planet Earth had to have been single celled organisms.
Compounds In the Cells
What is a compound? A substance that is composed of 2 or more different elements.
![[Glycerol]](http://biology.clc.uc.edu/graphics/bio104/glycerol.jpg)
- Proteins -
- Lipids -
- Carbohydrates-
- Nucleic Acids -
- ATP -
What is the difference between a producer, decomposer and a consumer?
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