What are the differences between pollen and algae cells?

What are the differences between pollen and algae cells?
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a. pollen cells have spikes; algae have tail-like projections
b. pollen cells help the body move; algae carry oxygen
c. pollen grains are hard tissue consisting of the protein collagen; algae consist of many cable-like bundles of axons
d. pollen cells are found in the walls of internal organs; algae are found in the walls of the heart