You have a religious concept of proof and truth, and these are incompatible with science and reality

Informed Social Issues

Scientists have directly observed cases where one group of organisms stops breeding successfully with its original group, forming what biologists call a new species. This shows evolution happening in real time, not just over millions of years.

• Primrose flower example: Scientists crossed two different primrose plants. The offspring were sterile. Then one plant doubled its chromosomes, became fertile, and could no longer breed with either parent. A new species appeared in the lab in one step.
• Goatsbeard flower example (Tragopogon): In the early 1900s, two European goatsbeard plants crossed naturally in America. Their hybrid offspring doubled chromosomes, became fertile, and formed new species (Tragopogon mirus and Tragopogon miscellus) that can't breed properly with the parents. This happened in the wild within 50–100 years.
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• Fruit fly example: In labs, fruit flies raised separately changed so much that when mixed back, they produced only sterile males. The groups could no longer make healthy offspring—new species formed under observation.
• Apple maggot fly example: Flies once laid eggs only in hawthorn fruit. After apples arrived in America, some switched. Now two groups exist: one on apples, one on hawthorns. They mate on their own fruit, prefer different smells, develop at different times, and rarely mix genes. They're splitting into separate species now.
• "Big Bird" finch on Galápagos: In 1981, a large finch from another island mated with a local one on Daphne Major. Their descendants formed a distinct group—bigger bodies, different songs and beaks—that mates only among themselves and doesn't mix much with originals. Researchers tracked this for decades; it's a new lineage forming right now.