Answer the following question given this paragraph: 

Radioactive strontium is dangerous because it can chemically replace calcium in the human body. The bones are particularly susceptible to radiation damage. Write the nuclear equation for the beta emission of strontium-90.


Q: What can radioactive strontium replace in the human body making it dangerous?

 Choices:

- potassium

- oxygen

- magnesium

- calcium

A:
calcium
