Which of the following sentences are true about molds and casts? (no spaces between letters-order alphabetically) (2 answers are correct)

A. Molds and casts both copy the shape of ancient organisms

B. A mold forms when the hard part of an organism is buried under sediment

C. A cast is a hollow area in sediment in the shape of an organism

D. Molds and casts do not show details of the organisms structure