Gill ridges and a bony tail....
Answer:
True
Explanation:
some genetics can cause mutations and can be passed down or skip generations
Answer:Exocrine glands are glands that secrete substances onto an epithelial surface by way of a duct.
Answer:
For one thing, there's lots more of it. There are many more environmental niches to be occupied in salt-water bodies, and importantly, they're all connected, making it easier for species to migrate and adapt to new habitats. Conversely, fresh-water habitats are often more isolated, confining species to a single habitat and decreasing the likelihood that they'll be able to migrate and adapt.
Explanation:
