Can someone please answer these 3 questions pls.

How is the carbon cycle related to global warming ?

Why is earth's outer core hotter than earth’s oceanic crust? earth’s oceanic crust is denser than earth’s outer core is. earth’s oceanic crust has lava flowing from the mantle. earth’s outer core has a composition of solid iron and nickel. earth’s outer core is deeper within earth than oceanic crust is.

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