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Biology 21 Online
OpenStudy (anonymous):

1. Why is Earth’s temperature just right for life? (1 point) Earth’s core is hot enough to heat Earth’s surface. Earth’s magnetic field creates suitable temperatures on Earth’s surface. Earth’s crust is warmed by heat from the sun. Earth’s atmosphere traps heat from the sun, which makes Earth’s temperature suitable for living things. 2. Which of the following statements accurately explains how Earth’s atmosphere supports life? (1 point) Earth’s atmosphere contains 78 percent oxygen, which is essential for life. Earth’s atmosphere contains 21 percent oxygen, which many life forms

OpenStudy (thadyoung):

1.d 2.b makes the most sense

OpenStudy (anonymous):

1.> d,a , both make sence 2.>b , cause earths atmosphere consists of 20.946 % , please give medals pleasey please.

OpenStudy (anonymous):

happy

OpenStudy (thadyoung):

happy,happy,happy

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