The Physical Activity Guidelines recommend that adults should do the equivalent of minutes of moderate-intensity physical activity each week to achieve and maintain a healthy body weight.

The correct answer is 150 minutes.

Explanation:

On the basis of the Physical Activity Guidelines, the majority of healthy adults should perform at least 150 minutes of moderately intense physical activity in a week in order to remain in a healthy state. Though more amount of aerobic activity would offer even more benefits, however, even a short amount of aerobic activities can also reap healthy rewards.  

The moderate form of aerobic activities comprise activities like mowing lawn, brisk walking, and swimming. This form of physical activity is suggested for all the individuals coming under the age group 18-60 years, unless and until a person is suffering from any kind of specific medical conditions. It is recommended for all the adults irrespective of race and gender.  

answer: carbon 14 can only be used to determine the age of the organisms that were once living, and igneous rocks are non living.

explanation: