Male gametes of higher spore plants and male gametes of animals are called spermatozoa

Male gametes of higher spore plants and male gametes of animals are called spermatozoa, and male gametes of seed plants are called sperm. Try to explain why different names are used for similar objects.

Both are haploid male germ cells.
Sperm have no flagella; they move along the pollen tube. Characteristic of gymnosperms and angiosperms.
Sperm motile, have a flagellum.

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