Which of the following does not support darwins theory of evolution?

fossil record

homologous structures

similarities in embryos

differences in plants

Homologous stuctures because, homo means same implying that the cell/animal is not change as it continues to reproduce

Evolution is a scientific theory used by biologists. It explains how living things change over a long time, and how they have come to be the way they are.

Fossil Record would be correct since it records history of life as documented by fossils. This supports Darwin's theory of evolution. 

Similarities in embryos would be correct since is shows these embryos all probably all have a common ancestor.

A homologous structure is an example of an organ or bone that appears in different animals, underlining anatomical commonalities demonstrating descent from a common ancestor. So, this would be correct too.

So, I think the answer is differences in plants. Differences in plants does NOT support Darwin's theory of evolution. 

I hope this helps:)

Where are they though?