Which of these particles is able to pass freely through a cell membrane?

The correct answer is d) oxygen molecule. Cell membrane or a phosphate bilipid layer is semi-permeable in nature i.e. it allows selective molecules to pass through it. Small and uncharged molecules can easily pass though it however, it prevents the movement of large and charged molecules.

Explanation:

A

Explanation:

I'm mostly sure that the answer would be A, because I'm mostly sure that it is a hydrophilic molecule

the supermassive black hole is in the middle of the galaxy.

the elements of art are the visual tools that the artist uses to create a composition. these are line, shape, color, value, form, texture, and space.

the principles of art and design are balance, contrast, emphasis, movement, pattern, rhythm, and unity/variety.