At what position if the earth in its orbit is it summertime in the northern hemisphere?

position 1
position 2
position 3
position 4

i think it is position 1 but idk

Explain the source of radioactivity in uranium in earth’s crust by which it produces nuclear radiation

What do isotopes of uranium have the same number of? what do they have a different number of? a) same number of protons; different number of electrons b) same number of protons; different number of neutrons c) same number of electrons; different number of protons d) same number of neutrons; different number of protons

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.