Answer:
protons is 7 neutrons should be 9
Explanation:
protons number is its atomic number
the number of protons and the number of neutrons determine an element's mass number.
Answer:
A. The rock was made from more than one type of material
C. Sediments and other matter were deposited in layers before lithification
Answer:
The correct answer is A.) Forms the plant cell wall.
I believe you meant to say is this mistake called a base pair and if that is your question then no. it would be called Mutation. But you can double check that answer.
