Gyri and sulci are the __ and __ , respectively, which characterize the surface of the human brain. A cortex; forebrain B grooves; folds C folds; grooves D fissures; folds

## Step 1<br />The problem is asking us to identify the correct terms that describe the surface of the human brain. The terms are gyri and sulci.<br /><br />## Step 2<br />Gyri are the folds or ridges on the surface of the brain. They increase the surface area of the brain, allowing for more neurons and thus more cognitive abilities.<br /><br />## Step 3<br />Sulci are the grooves or depressions on the brain's surface. They separate the gyri and help to increase the brain's surface area.<br /><br />## Step 4<br />By comparing the definitions of gyri and sulci with the options given, we can see that option C, "folds; grooves", correctly identifies the terms.