Which statement best describes a particular group of stars on the Hertzsprung-Russell Diagram? F.
Stars that are cool and dim are located in the lower-left quandrant and belong to spectral class O.

G.
Stars that are hot and luminous are located in the upper-left quandrant and belong to spectral class O.

H.
Stars that are hot and dim are located in the lower-right quandrant and belong to spectral class M.

J.
Stars that are cool and luminous are located in the upper-right quandrant and belong to spectral class F.

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

може ли да зареждате повече информация, моля