The northern hemisphere is warmer in the summer than the winter because the northern hemisphere are pointing toward the sun. Because of this the rays hit us more directly making is hotter. So during the winter when the northern hemisphere is not pointing toward us, it makes is colder. It also depends on the tilt of the axis. When it is more direct it makes the temperature hotter.
2 because the 1st energy level can only hold 2 electrons and the 2nd holds 4
I believe it's oxygenated or oxygen rich blood away from the heart.
I can answer the third one:
Photosynthesis takes place in two stages<span>: light-dependent reactions and the Calvin cycle (light-independent reactions).</span>
I believe the term for two similar chromosomes would be homologous chromosomes.
