Sr-90 has a half-life of 30 years. If our sample of Sr-90 now has a mass of 1500 grams, what was the mass of our Strontium-90 90 years ago.

Forensic nursing is a medical-specialist career that grew out of a response to divorce in society. true false

Graphs you see question 5 options: the change in data over time the relationship between different dependent variables the relationship between the independent variable and the dependent variable/s the relationship between different independent variables

The response is the basis for vaccination. primary secondary tertiary none of the above