1. biologists in darwin's time had already begun to understand that living things change over time. how did darwin contribute to these ideas? . a) he found many fossils that showed that these changes could not possibly happen on islands. b) he figured out and explained how these changes happened and supported his ideas with evidence. c) he made guesses about how these changes happened, and wrote experiments that could be used to test these guesses. d) he was the first person to truly believe that these changes happened, and he worked very hard to convince others

Answer: Option  B) He figured out and explained how these changes happened and supported his ideas with evidence.

Explanation:

Darwin contributed to the theory of evolution by not only proposing ideas but by also giving evidence to support it. Darwin explained how the individuals of different species have evolved over time and accumulated variations, and the concept is known as descent with modification.Darwin's  5 year trip from Western Europe to South America, New Zealand, around the Cape of Good Hope in southern Africa and back to Europe proved to be very fruitful as it provided a lot of evidence to support his theory. The most important information came from the differences in the finches he observed on Galapagos Island, and today, these finches are known as Darwin's finches in his honor. He made diagrams corresponding to what he observed on the islands, and this provided a good enough evidence to support his theory.

Biologists in Darwin's time had already begun to understand that living things change over time and to explain this by following contribution
He figured out and explained how these changes happened and supported his ideas 
he not only said but also proved it with evidence so correct option i conclude is B
hope it helps