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this option is the correct they move to an area with lower oxygen concentration because gas molecules can pass through semi-permeable and do not need transport proteins for the movement
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i hope this will help you
When a liquid goes from a liquid state to a gaseous state it is called evaporation
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A typical atom consists of three subatomic particles: protons, neutrons, and electrons (as seen in the helium atom below). Other particles exist as well, such as alpha and beta particles (which are discussed below). The Bohr model shows the three basic subatomic particles in a simple manner. Most of an atom's mass is in the nucleus—a small, dense area at the center of every atom, composed of nucleons. Nucleons include protons and neutrons. All the positive charge of an atom is contained in the nucleus, and originates from the protons. Neutrons are neutrally-charged. Electrons, which are negatively-charged, are located outside of the nucleus.
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An atom bonds to have eight valence electrons to become stable. ... The third shell would be empty so that the eight electrons in the second level would be outermost after the atom loses one electron.
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