1. Cell is the basic unit of organism structure and function. All living things are made up of cells except viruses. Cells are the most basic life system on earth.

2. Plants have no (systematic) grades, and single-celled organisms can be transformed into (individual) and (cell) grades.

3. Material and energy exchange between organism and environment based on cell metabolism; Growth and development based on cell proliferation and differentiation; Heredity and variation based on intracellular gene transfer and change.

4. Prokaryotes: cyanobacteria, which contain (chlorophyll) and (phycocyanin), can carry out photosynthesis and belong to autotrophs.

5. Whether or not a substance is absorbed and how much it is absorbed depends on the type and quantity of carriers on the cell membrane.