Which statement about electric and magnetic fields is true?

A. Electric fields and magnetic fields loop from north to south.

B. Electric fields must leave a positive charge and end on a negative charge.

C. Electric fields and magnetic fields start at a postive and end at a negative.

D. Magnetic fields must start at the north pole of a magnet and end at the south pole of a magnet.

For each of the following, decide whether the statement describes photosynthesis, cellular respiration, or both. releases energy in the form of atp. stores energy in glucose molecules. performed by producers. performed by consumers.

Atypical human cell is approximately 12.00 μm in diameter and enclosed by a membrane that is 5.000 nm thick. (a) what is the volume of the cell including the membrane? (b) what is the volume of the cell membrane? (c) what percent of the total volume does its membrane occupy? to simplify the calculations, model the cell as a sphere. enter your answers using four significant figures.

15 ! come and answer! a(n) is the general term for an infectious disease that has spread across a city, region, or country.