WHAT SHOULD BE THE FIRST INGREDIENT IN DOG FOOD?
The answer is whole meat.
Corn should not be the first ingredient, it is just a filler. Dogs cannot fully digest corn so they cannot get nutrients from it.
By products are meat parts such as organs, feet, liver, etc. These are not the healthiest choice for dog food and it is rarely specified what the by products are. You could have chicken liver, or you could have cow's feet and you wouldn't know. Things like feathers and fecal matter also tend to get into by products.
Meat meal is actually perfectly fine in dog food. It is the same as whole meat, just ground up and more processed, because of this however it is not the best choice, which is whole meat, but it is still perfectly acceptable.
WHY IS GRAVEL IMPORTANT IN FISH TANKS?
The answer is that it grows bacteria.
Bacteria love to live in gravel and without gravel there wouldn't be many places for the bacteria to live and grow. You need to have a healthy amount of bacteria in the fish tank to naturally break down the wastes that accumulate in the tank that could harm or kill your fish. No bacteria = No fish. (living fish that is)
It's pretty too. (although that isn't why it's important)
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