Scientific theories explain why something happens and scientific laws describe what happens
All species provide some sort of function to an ecosystem. In an ecosystem they can act as producers, decomposers, and help to cycle water. throughout the ecosystem, it can control erosion and pests and fix atmospheric gases.
An ionic bond is formed when charged atoms or molecules are attracted to each other
They regulate and function and form the structures of the body's organs and tissues. They do most of the work in their cells, and they are a major source of energy.
Hope that helped you.
oxygen reacts with glucose in respiration