Question

why did some groups oppose darwins theory?
it lacked scientific evidence
it was too mathematically complex
it contradicted religious beliefs
it was too expensive to research

Explanation:

Darwin's theory of evolution by natural selection challenged the religious view of creation (e.g., special creation as per many religious texts). At the time, religious beliefs were very influential. While the theory had scientific evidence (like fossil records, observations of species variation), and it wasn't overly mathematical in a way that would be a mass - opposition factor, and research cost wasn't a main opposition reason. The key clash was with religious doctrines that posited a different origin of species.

Answer:

It contradicted religious beliefs