Organisms must transport substances to and from the external environment.
Identify one substance which cells must transport across the cell membrane to support cell functions.
The diagram shows particles of two gases.
Complete the diagram by drawing the arrangement of the gas particles after 1 hour.
(1)
Name the process shown in part (i).
(1)
Describe an example of where movement of gases as shown in part (b) is important in multicellular organisms.
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