Which of the following is true of the cerebral hemispheres of the human brain? group of answer choices
a) nearly the entire surface of the cerebral hemispheres is marked by elevated ridges called sulci.
b) the cerebral hemispheres account for about 83% of total brain mass.
c) the longitudinal fissure separates the cerebral hemispheres from the cerebellum.
d) nearly the entire surface of the cerebral hemispheres is marked by shallow grooves called gyri.

The answer is Letter B. It is the only true affirmation.

Explanation:

The cerebral hemispheres account for about 83% of total brain mass.

The other alternatives are false because the longitudinal fissure is the deep groove that separates the two hemisphere of the vertebrate brain.

Gyri is not the shallow groove that mark the nearly entire surface of he cerebral hemispheres. Gyri is a ridge on the cerebral cortex.

Sulci is not the elevate ridge that marks nearly the entire surface of the cerebral hemisphere. Sulci is a depression that surrounds the cerebral cortex.

The Gyri and the Sulci create the folded appearence of the human brain and some other mammals.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.