Which of the following describes a magnetic field?

A magnetic field is a vector field that describes the magnetic influence of electric charges in relative motion and magnetized materials. ... Magnetic fields exert forces on nearby moving electrical charges and torques on nearby magnets.

amber has allowed scientists to study dna that has been preserved over millions of years.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.