Explanation:
A gene is the basic physical and functional unit of heredity. Genes are made up of DNA. Some genes act as instructions to make molecules called proteins.
Waxes (option a) is correct
I think this is correct
1. Organelle, cells, tissues, organs, organ systems, organisms, population, communities, ecosystems and finally biosphere.
2. (Human Body) Bone cells, Fat cells, Nerve cells.
3. neuron, a collection of neurons, nervous system, brain
4. Plants don't have a liver, stomach or lungs, while animal organ systems do.
