950 A.D. Named after the Norse fire god Surtur, Surtsey (Surtur's island) is one of the world's newest islands. In November 1963, Surtsey was formed in a volcanic eruption which heaved it up out of the waters 18 km (11 mi) south-west of Heimaey; 32 km (20 mi) off the south coast of Iceland.
Answer;
-Variety
Ethan is not achieving the variety principle
Explanation;
-Eating a variety of foods and choosing the appropriate number of servings from the food guide pyramid is something that many people do not do.
-No two food items provide the exact same nutrients and this is why it is important to eat an assortment of foods. This means that some food items are better sources for nutrients than other items and vise versa.
-Balance and moderation are also important aspects of daily intake of food. Balance compares with variety because of the importance of eating a balanced diet from the Food Pyramid. Also balance is associated with caloric intake/expenditure.When equality is found between food intake (calories taken in to the body) and physical exercise (caloric expenditure) a maintaining of body weight occurs.
Moderation involves controlling or regulation of food intake.
<span>c. skeletal muscle contractions that are planned and conducted to increase muscle mass
</span><span>Skeletal muscle contraction is one immediate effect of exercise on the muscular system. Other effects include higher blood flow to muscles and increased muscle temperature, Regular exercise increases bone width and density, strengthens muscles, tendons, and ligaments. It also increases flexibility at joints. Exercise also leads to bigger muscles, improved muscle endurance, and more stable joints</span>
