Which of the following indicates that the universe is expanding?

Question 21 options:

The spectra of Cepheid variables, which are found only in our galaxy, are red shifted.

The spectra of Cepheid variables, which are found in all galaxies, are red shifted.

HELP!!! The spectra of Cepheid variables, which are found only in our galaxy, are blue shifted.

The spectra of Cepheid variables, which are found in all galaxies, are blue shifted.

the second one

Explanation:

The spectra of Cepheid variables, which are found in all galaxies, are red shifted.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

both anaerobic and aerobic respiration use glucose (or other carbohydrates), proteins and lipids to produce atp and nadh. cell uses those energy molecules, obtained from food and   breaks them down during the chemical reactions of respiration. in anaerobic respiration, nadh is regenerated to nad+ by enzymes lactate dehydrogenase (lactate is produced, e.g. in muscle cells) or by alcohol dehydrogenase where ethanol is produced (alcohol fermentation), while in aerobic respiration, electrons from nadh are deposited in the mitochondria to regenerate nad+ (electron transport chain. anaerobic respiration produces 2 atp per molecule of glucose compared to aerobic respiration where about 38 atp molecules are produced.