The correct answer to this question is this one: they lacked oxygen. The earliest organisms were completely heterotrophic in nature because of the reason that they lacked oxygen. <span>A heterotroph is an organism that cannot fix carbon and uses organic carbon for growth. </span>
Answer:
Its Lipids kids
Explanation:
Lipids contains fatty acids and have three fatty acid chains bonded to glycerol.
C) electrician
((ignore this brainly wants 20+ characters))
Answer:
B the plants
Explanation:
The first level on a food pyramid has the most stored energy
