Which brain structure is identified by the arrow in the figure?

a. cerebellum
b. medulla
c. pons
d. corpus callosum

Option A, Cerebellum

Explanation:

The portion of brain highlighted in this image is cerebellum. A cerebellum is located  just behind the top part of the brain stem. Also at the location of cerebellum, the spinal cord meets with the brain. The cerebellum consists of two half parts known as hemisphere. The major function of cerebellum includes receiving of information from nervous system, spinal cord and other brain parts  and regulating motor movements.  

Hence, Option A is correct

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?