Based on the description of the stages of embryo development provided, the two patterns that can be seen in the diagram are:
C. Fish begin to take on a different appearance from the other organisms in Stage 3.
D. Mammal embryos have more detailed facial features than other organisms in stage 4.
These two options highlight specific observations regarding the differentiating features and stages of development for the organisms mentioned. Option A is incorrect as all organisms in the study do begin their development as an egg, option B is incorrect because the embryos are still quite similar in stage 1, and option E is incorrect because the organisms show distinct differences in appearance in Stage 5.