The core of earth is made out of iron and nickel the outer core's temperature is so hot that it melts the metal inner core solid metal what causes these differences?

What is turgor pressure, what causes it, and what does it do for a plant?

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Explain what a zygote is. use the terms egg cell, sperm cell, and fertilization in your explanation.