Which of the following cell structures do eukaryotes and prokaryotes have in common? (4 points)

Cell wall

DNA

Nucleus

Nucleoid

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?

Plz quick a natural resource that is replaceable through a cycle in nature or sustainable practice is called a? the subject is science