1. Through blood transfusion
2. Unprotected sex
3. In contact of body fluids
4. Mother to baby during birth or through breast feeding.
Answer:
by signals that the nervous system sends to the brain
Explanation:
None of the answer make logical sense except overfishing.
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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