What do you mean by 'major' and by 'parts'?
by major are you referring to size, importance to the survival of the animal or most consumed parts?
brain and spinal cord
yes,they have two main body parts
yes
yes
The two main parts are the Head and Body.
No. Spiders (including Tarantulas) have two main body parts -- the cephalothorax and the abdomen -- and eights legs. It is insects have three main body parts, as well as six legs.
the parecula has 4 body parts 3 fins and the main body
In Humans, a meniscus is present in the knee, jaw, and the sternoclavicular joints.
An insect has thre parts - head, thorax and abdomen. An arachnid just has two - cephalothorax and abdomen.
The two coordination systems of the body are the nervous systems and the endocrine sytems, which enable all parts of the body to work together as one.
I think this word is bifurcation .Bifurcation means the splitting of a main body into two parts.
Piston & Cylinder are two main parts of an engine.