Very few fossils of jellyfish or their close relatives have been found. this makes it hard to trace the evolutionary history of jellyfish using the fossil record. what explains this? a. jellyfish fossils are buried deep under the ocean floor, not in land areas where scientists hunt for fossils. b. jellyfish have soft bodies that decay completely before fossilization can occur. c. jellyfish are a relatively new species in the history of living things on earth and do not have ancient ancestors. d. jellyfish fossils are likely more fragile than other types of fossils and so they degrade before they can be examined.

if you listed your answers right then i believe your answer is b.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.