Passive transport is the movement of substances across the membrane without the expenditure of cellular energy.
The sun is the primary source of energy for living things mostly organisms like plants and ecosystems. But if you're talking about the bonds inside organic molecules, which are carbohydrates. With this, the energy from the sun gets trapped within a chemical bond and still relates to photosynthesis in plants.
Myelin sheaths are found on the outside of nerve cells. They protect the sensitive axons underneath like how insulation protects wires.
D.uracil is the nitrogen base bind with adenine
I believe all living things in the domain are sorted into Kingdoms.
