How does the size of a star influence its brightness

What is the result of the greenhouse effect? a. heat is deflected from the atmosphere. b. heat is released from the atmosphere. c. heat is kept in the atmosphere. d. plants are able to grow in the tropics where the air is the heaviest.

Which of teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)

The nations of indochina a. share a common langauge b. share a common history c. share a common religion d. none of the above