1. why is earth's temperature just right for life?
a: earth's core is hot enough to heat earth's surface.
b: earth's magnetic field creates suitable temperatures on earth's surface.
c: earth's crust is warmed by heat from the sun
d: earth's atmosphere traps heat from the sun, which makes earth's temperature suitable for living things
2. which of the following statrements accurately explains how earth's atmosphere supports life
a: earth's atmosphere contains 78 percent oxygen, which is essential for life.
b: earth's atmosphere contains 21 percent oxygen, which many life forms need to survive
c: earth's atmosphere contains more oxygen then carbon dioxide
d: earth's atmosphere contains carbon dioxide, which all life forms breathe in