Answer to Question 1
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Answer to Question 2
The dust in the ISM makes distant stars appear fainter than they would if space were
perfectly transparent. This phenomenon is called interstellar extinction, and in the neighborhood of the Sun it amounts to about 1 magnitude per thousand parsecs (pc) at visual wavelengths.
The ISM dust also affects the colors of stars. That is the reason why extinction is more severe at shorter wavelengths, which makes stars look redder than they should be. Some hot but distant O stars, for instance, actually look red and not blue. This effect is called interstellar reddening.
Some of the bacteria that can fix atmospheric nitrogen, converting it into a form usable by plants.
Embryonic cells form the placenta
Instructions for Completing the CMS-1500 (02/12) Claim Form Continued
How prefixes and suffixes can be combined with a word root to form many medical terms.
The Upper Troposphere: Rossby Waves
standard reduction potential (Eo), the greater the tendency of the oxidized form of a redox couple