[D] Could AI use what it learns in one subject to assist learning in another?

The problem with "AI" is that it almost never looks enough like our intelligence. So, depending on what we think is similar and what we think is not, the answer to your question will change, but we don't really know. I can answer your question with what I think can be similar: when you train an "AI" on cats and dogs, the AI will process the images with convolution filters. It'll process the image with a learned mathematical function. Well, this function can be applied to images of birds such that the information you extract from bird images is useful enough to learn faster what a bird is compared to a snake.