Question

Why was Darwin theory controversial in the 1800s

Answer 1

Darwin's theory caused a lot of controversy and his ideas were only gradually accepted. Some people do not believe them today. Some of the reasons for this include:

Darwin’s theory conflicted with religious views that God had made all the animals and plants on Earth Darwin did not have enough evidence at the time to convince many scientists.
It was 50 years after Darwin’s theory was published that the way that inheritance and variation worked was discovered the genes that allow these individuals to be successful are passed to their offspring .

Answer 2

The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring. 

Evolution by natural selection is one of the best substantiated theories in the history of science, supported by evidence from a wide variety of scientific disciplines, including paleontology, geology, genetics and developmental biology.

The theory has two main points, said Brian Richmond, curator of human origins at the American Museum of Natural History in New York City. "All life on Earth is connected and related to each other," and this diversity of life is a product of "modifications of populations by natural selection, where some traits were favored in and environment over others," he said.