Question

At the turn of the 19th century, how long had tardigrades been known to exist?

O15 years
O28 years
O77 years
O128 years

Answer 1

Tardigrades were first described by Johann August Ephraim Goeze in 1773, so by the turn of the 19th century, they had been known to exist for approximately 28 years. Therefore, the answer is 28 years.

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