Can oxygen and Carbon dioxide molecules move across the cell membrane without help?
Carbon dioxide can because it is non-polar, oxygen cannot because it is polar.
Oxygen can because it is non-polar, but Carbon dioxide can't because it is too
big
Yes, because they are both non-polar molecules and they are both very small.
Neither can because the phospholipids are tightly held together and nothing
passes through them.

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explanation:

explanation:

the sun shines white and black light to our planet. the white light has all the colors in it. in our upper atmosphere, we have dust particles and oxygen molecules. the white light meaning all of the colors in a rainbow shines through the upper levels of the atmopshere and the blue light scatters across the entire planet. that is why our sky is blue.