What observations did Darwin make regarding ostriches?

Darwin noted that ostriches found in one part of Argentina were different from another part of that country, and both were different from those found in Africa.

Explanation:

Charles Darwin was a British naturalist who proposed the hypothesis of organic advancement by regular choice. Darwin characterized advancement as "plummet with adjustment," the possibility that species change after some time, offer ascent to new species and offer a typical precursor. On his visit to the Galapagos Islands, Charles Darwin found a few types of finches that fluctuated from island to island, which helped him to build up his hypothesis of regular determination.

He expresses that the phases of improvement when undeveloped organisms seem to be like each other are additionally the phases where incipient organisms by and large don't associate with the outside condition.

b is the correct answer