The original source of the soil organic matter is plant tissue. In the forest, organic matter is added in the soil mainly in the form of fallen leaves. Under natural conditions, the tops and roots of trees, shrubs, grasses and other native plants annually supply large quantities of organic residues.
Atomic weights are weighted averages calculated by multiplying the relative abundance of each isotope by its atomic mass and then summing up all the products.
Answer:
C. Alkaline Metal ok thanks
Answer: Carbonic acid occurs naturally in the body and performs important regulatory functions.
Explanation: Carbonic acid ( 
) is an acid formed from the carbon dioxide present in the body. It is also known as the respiratory acid as it helps in the transport of carbon dioxide in the body.
With the help of enzyme Carbonic Anhydrase, carbon dioxide is converted into carbonic acid. This acid is an unstable intermediate which gets dissociated into bicarbonate ions ( 
) and 
ions. immediatley.
Therefore, Carbonic acid performs important regulatory functions in the body.
