PLEASE HELP! VERY URGENT!

1) Everything about a star depends on its .
2) Mass also determines how long a star and the of its life.

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

Religious conflict in northern ireland started with a) cultural differences resulting from viking invasions around 800 b) england’s split from the catholic church in the 1500s c) rebellions in ireland between 1916 and 1921 d) the norman invasion of england in 1066

Why slip off slopes are found on the inside of meanders? why river cliffs are found on the outside of meanders?