The pneumatic bones are important to birds for respiration. They are hollow bones which are connected to the bird's respiratory system and are important for birds to be able to breath. Examples of pneumatic bones are the skull, humerus, clavicle, keel (sternum), pelvic girdle, and the lumbar and sacral vertebrae.
Because the interior of the lipid bilayer contains the nonpolar _____molecules__________, only small nonpolar substances are able to diffuse directly across the cell membrane
Because it’s time consuming and money consuming to observe from space so models are required
Decomposer are the tiny organisms that break down and absorb nutrients from dead organisms
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