A rock sample has a half-life of 30 years, and it originally had 1,000g of radioactive material. After 90 years, how much of the original material is left?

If a man does not use a condom will he get a std

Kara started an exercise program kara's sister works out with her on a regular basis and even talks to kara about her progress in the scenario what is another name for kara's sister? a. goal-setterb. self-monitorc. support systemd. nutritionist

Which stage of stress includes the fight or flight response?