B cuz they can appear at any time
Answer: Rust is an example of a chemical change.
Explanation: Remember, a chemical change has to do with chemicals permanently changing something. Rust comes form metal and oxygen. When these two chemicals mix, it causes rust.
It might be D considering the location.
Answer:
the beginning of the Cenozoic
Explanation:
- The Cenozoic period began with the 65 million years ago and continuous till today and is composed of the modern-day inhabitants and is also known as the age of mammals and these were as the hornless rhinos and flight less dinosaurs.