Cerebral hemisphere is the centre of

What does the $Corpus$ $callosum$ connect?

Read the following statements carefully and select the correct option:
$I.$ The medulla is connected to the spinal cord.
$II.$ Medulla contains controlling centres for respiration,cardiovascular reflexes and gastric secretion.
$III.$ Cerebellum has a very convoluted surface in order to provide the additional space for more neurons.

The left and right cerebral hemispheres are connected by a tract of nerve fibers,which is called the ...... .

Corpora striata is found in

The cerebral hemispheres of mammals consist of: