How does the membrane of the cell differ from the nuclear membrane? what advantages does this difference have for the nucleus?

Why do we perceive objects as retaining their brightness under different lighting levels?

Body temperature is tightly regulated in mammals for example when external temperatures drop too much the body of a mammal responds by in order to its core temperature?

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