Which of these substances can pass directly through cell surface membranes without using a carrier protein or a channel protein?
1- ${\text{ }}C{a^{2 + }}$
2- ${\text{ }}C{O_2}$
3- ${\text{ }}{C_6}{H_{12}}{O_6}$
1 )
1 and 2
2 )
1 and 3
3 )
2 and 3
2 only
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