Answer: Bio film that grows on the logs and feeds the lake.
Acting as levers for movement is a function of: bones.
Movement can be defined as a process through which several skeletal muscles in the body systems act together as a group, in order to cause a change in the motion of a body part.
Basically, bodily movement are produced when skeletal muscles exerts a force on the tendons, which in turn pull on the bones (levers) and other supporting structures such as the skin.
In the body of living organisms, bones act as levers for movement by enhancing limb speed or power of limb movements while joints act as a fixed point of movement (fulcrum).
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Lungs, nose, airway, mouth, pharynx, larynx,trachea,bronchi, and bronchioles. Its three of those but thats all i could think of from the top of my head. Good luck
Skin cells are together to provide protection and strength.
