7. The sun's surface is about a. 2000 °C
b. 3000 °C
c. 4000 °C
d. 5000 °C
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Most animal cell membranes have proteins that pump. ions out of the cell and potassium ions into this

Which characteristic should describe all evidence collected by a scientist? true obvious objective subjective

Which does not describe a physical change happening to water? water evaporating in the sun water reacting with nitrogen gas water freezing and being broken apart with a knife water heating up on a stove