BONE FORMATION The tissues seen above are building blocks
of a developing bone. Resembling unordered timbers at the first
look, these tissues will increasingly strengthen and become
an extremely hard and strong bone.
TRACHEA Green extensions function like an air filter.
Their job is to clean the air we inhale. The extensions are
covered with a viscous substance called "mucus". Thus, foreign
materials are prevented from reaching the lung.
