Risks for chronic disease can be reduced by participating in moderate physical activity for a minimum of .20 minutes a day, every day of the weekb.30 minutes a day, every day of the weekc.20 minutes a day, two days out of the weekd.30 minutes a day, most days of the week select the best answer from the choices provided.

Option C

Explanation: The risk of cardiovascular disease can be cured by performing exercise. Exercise helps in the maintaining proper blood circulation inside body.

It also helps in thinning of blood so that proper blood can be maintained in the heart.

So, regular exercise of 20 minutes a day, two days out of the week is necessary to maintain a good health.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

the titanic would be the correct answer