Answer:
a:nitrogen is essential for living things to survive on Earth. Animals and plants need nitrogen.
b:Without decomposers and other types of bacteria, the nitrogen cycle would not be maintained
Answer:
Eardrum→Ossicles→Oval window→Endolymph→Perilymph
Explanation:
The Ear is the organ of hearing and in mammals balance. In mammals the ear is often described as having three parts- The outer ear, the middle ear and the inner ear. the outer ear consist of the pinna and ear canal. The middle ear include the lymphatic cavity and the three ossicles. The inner ear sits in the bony labyrinth, and contain structures which are key to several senses: The semi circular canal which enable balance and eye tracking when moving. The Utricle and saccule which enable balance when stationary and the cochlea which enable hearing.
Answer:
The mandibular canal, also referred to as the Inferior Alveolar Canal (IAC), sits within the mandible. It serves the purpose of housing the <em>inferior alveolar nerve</em> which is responsible for supplying sensation to the lower teeth.
This canal also houses the <em>inferior alveolar vein</em> - a dental vein whose function is to (with the assistance of the posterior alveolar artery) drain blood from the lower teeth and jaw.
A picture of the mandibular canal is attached.
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