Which statement best explains why the overall charge on an atom is zero? the positive charge of the neutrons in the nucleus equals the negative charge in the electron cloud. the positive charge of the protons in the nucleus equals the negative charge in the electron cloud. the negative charge of the neutrons in the nucleus equals the positive charge in the electron cloud. the negative charge of the protons in the nucleus equals the positive charge in the electron clou

Plz plz plz quick! 49 points for whoever which of the following statements about greenhouse effect is true? *life on earth is suffering because of greenhouse effect *the greenhouse effect is caused by human activity *all greenhouse gases are harmful *life on earth would not exist without the greenhouse effect

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.

Which of these parts of the membrane large moecules pass through it ?