Question

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 look 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.

B?

Answer 1

Right.

Answer 2

B is right.

Answer 3

Yup B is correct!

Answer 4

right

Answer 5

After an avalanche, a huge block of stone slid down a mountain and landed in the middle of a road. People in the nearby town had a very difficult time moving it out of the road. The block of stone is difficult to move because?

Answer 6

its heavy

Answer 7

[AI-generated answer — Explain Bot]

Yes, option B is the correct answer. Jellyfish have soft bodies that decay rapidly after death, which makes fossilization rare. Fossilization typically requires the preservation of hard structures, such as bones or shells, which can withstand the processes of decay and mineralization. Since jellyfish lack these hard structures, they are less likely to be preserved as fossils. Therefore, the scarcity of jellyfish fossils makes it challenging to trace their evolutionary history using the fossil record.