Humus is a highly complex substance still not fully understood. It is a stable and uniformly dark, spongy and amorphous material which come from the mechanical degradation of organic matter. Humus is fertile and gather all properties suitable for optimal plant growth. It is formed by complex chemical compounds, of plant, animal and mircrobial origin.
An unbalanced Chemical Equation only tells us which componds react With eachother and what the Product is.
A balansed Equation also tells us how many molecules of each reactant, and how many molecules of Product in a reaction.
Answer:
<h3>Mandible bone</h3>
Explanation:
The nasal cavity externally opens through the nostrils, continues to the pharynx, where, further joins the remaining respiratory system. In the middle, it is separated by the nasal septum. The division of nostrils includes roof, floor, and walls whereas the nasal cavity is divided into the
a) vestibule - It is the dilated area at the nostril opening
b) respiratory - It is the passages through which air travels into the respiratory system
c) olfactory sections- It has olfactory receptors & Bowman's glands.
Surrounding structures:-
a) Para-nasal sinuses
b) Nasolacrimal ducts
c) Oral cavity