Substance x is converted to substance y in a chemical reaction. what role would a catalyst play in this scenario?

Coquina, a type of limestone, forms from shell fragments that settle on the ocean floor. what type of rock is coquina?

Hurry which of these is true about index fossils? a) are very scarcely found b) used as guides in relative dating c) found in the youngest layer of the rock d) used as reference points in absolute dating

Abnormal softening of a gland is known as