At the center of our Galaxy lies A) a quasar. B) a huge ...

[misspop]

At the center of our Galaxy lies
 
  A) a quasar.
  B) a huge emission nebula.
  C) an intensely bright visible superstar.
  D) the largest of all globular clusters.
  E) a black hole of millions of solar masses.

Question 2

What is the most abundant gas in the atmospheres of Mars and Venus? Explain why it is not as abundant in Earth's atmosphere.
 
  What will be an ideal response?

[macybarnes]

Answer to Question 1

E

Answer to Question 2

The carbon dioxide so abundant on our neighbors was first dissolved in the Earth's early water oceans, then deposited beneath them in carbonate rocks such as limestone. Also, photosynthesis took much of the remaining carbon dioxide and water and combined them to make carbohydrates and release oxygen into our unique atmosphere.

[misspop]

TY

[macybarnes]

You're welcome