<h2>Answer:</h2>
A. hydrogen
Nearly all organic compounds also contain H atoms, which explains why plants need the H they get from water molecules through photosynthesis. Hydrogen ions are vital in both aiding proton gradients to help drive the electron transport chain in photosynthesis, and for plant respiration.
<h3>#CarryOnLearning</h3>
The axon releases neurotransmitters
Because all organisms are made up of cells and there are different types of cells which carry different functions.
Urbanization has changed literally everything over the years from the environment being destroyed little by little but also it effects water pollution and by factories being made puts a bunch of terrible greenhouse gasses that are not healthy to breath in.
mark this as best if helps
