What is vega? A- Fusing hydrogen at its core B-It has lost its outer shell and only retained hot core that is slowly losing its brightness C- it’s temperature has decreased but it shining brighter than before

It is fusing hydrogen at its core.

Explanation: Main sequence stars fuse hydrogen atoms to form helium atoms in their cores. About 90 percent of the stars in the universe, including the sun, are main sequence stars.

the answer is c.) there is a warm front in region a and a stationary front in region b.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.