Which part of an organism is typically preserved in cast and mold fossils?

• A. Color patterns
• B. Hard parts like bones and shells
• C. DNA
• D. Soft tissues

Answer: (B)

Verified step by step guidance

1. Understand the concept of cast and mold fossils: These types of fossils are formed when an organism's hard parts, such as bones or shells, leave an impression in sediment that later hardens into rock.
2. Recognize that soft tissues and color patterns are less likely to be preserved because they decompose quickly after the organism's death.
3. Identify that hard parts like bones and shells are more durable and can leave a lasting impression in the sediment, which is why they are typically preserved in cast and mold fossils.
4. Consider the process of fossilization: After the organism's hard parts create an impression, minerals can fill the mold, creating a cast that replicates the shape of the original hard parts.
5. Conclude that the preservation of hard parts in cast and mold fossils provides valuable information about the organism's structure and form, but not about its color patterns or DNA.