Gdz Po Biologii 8 Klass R.t Opora I Dvizhenie Onlain Sonin (2027)

: Bones are made of organic substances (which provide flexibility) and inorganic minerals like calcium (which provide hardness).

: Muscles often work in pairs (like the biceps and triceps); when one contracts, the other relaxes to produce movement at a joint. gdz po biologii 8 klass r.t opora i dvizhenie onlain sonin

: Skeletal muscles (striated) are responsible for voluntary movements, while smooth muscles control internal organs and are involuntary. : Bones are made of organic substances (which

: Functions as a support frame, protects internal organs, and allows for movement. It consists of the skull, spinal column, rib cage, and the skeleton of the upper and lower limbs. when one contracts