1. The first element in the universe was
O hydrogen
lithium
helium
carbon

Explain why the rate of urbanisation is in the way it is between developed and undeveloped countries.

Largest layer of atmosphere international space station orbits ultraviolet radiation causes ionization the phrases describe what layer of earth's atmosphere?

Write the formula for the area of a triangle, a, where b is the base and h is the height of the triangle. don’t include parentheses in your answer.