Foliated rocks are distinguished by a. layers c. large mineral grains b. lack of layers d. air holes

The correct answers i the option (a) layers.

The foliated rocks are those rocks, which forms by the alignment of the minerals due to pressure. These rocks are a type of metamorphic rocks. The alignement of the minerals makes them to align in the layers. Hence, the layers present in the rocks are distinguished by the presence of layers of different mineral bands.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms