Which of the following statements is true? 1) health officials recommend exercising at least three times a week. 2) periodontitis is caused by a lack of potassium in the diet. 3) fruits and vegetables are good sources of protein. 4) a high-sugar, high-fat diet is not unhealthy if the body gets enough calcium.

The correct answer is option 1)

Explanation:

As per the guidance of the department of health and human services, a healthy adult should exercise 145 minutes with medium intensity or 75 minutes with a vigorous intensity of physical activity a week or minimum thrice a week.

Periodontitis is a serious bacterial infection of gums that damages the bone that supports teeth and soft tissues. fruits and vegetables are generally sources of carbohydrates however beans and lentils are the source of protein too.

Thus, the correct answer is option - 1)  Health officials recommend exercising at least three times a week.

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.