The organ that protects the main nerve cord is
skull
back bone
breast bone
chest bone
The given figure illustrate a part of human skeletal system. Which part of body is protected by the illustrated figure?
Spinal cord
Rib cage
Brain
Heart
The diagram below shows a human arm bending at the elbow. Which two body systems most directly cause the arm to bend?
Skeletal and muscular
Reproductive and circulation
Respiratory and excretory
Nervous and digestive
Knee joints are
hinge joints
ball and socket joints
pivotal joints
fixed joints
Fishes swim by
forming loops alternately on two sides of the body.
forming loops on single side
somersalting
alternate dipping and coming up
