What are the advantages and disadvantages of using quasars to probe the early history of the universe?

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.

How is the acceleration of an object in uniform circular motion constant? a - in magnitude only b - in direction only c - in both magnitude and direction d - in magnitude, direction & orientation

Provides most of the energy used in the world today. question 4 options: wind fossil fuel moving water sunlight