What is electromagnetic spectrum made up of

Which of the following changes to a pipe would increase the conductance by a factor of 12? 1.quadrupling the length and tripling the radius.2.reducing the length by a factor of and doubling the radius.3.tripling the length and reducing the radius by a factor of .4.reducing the length but a factor of and doubling the radius.

What component of earth’s atmosphere exists entirely as a result of photosynthesis?

Atoms in a molecule are bonded together by sharing gaining or losing_