Every item of food on the table (sour, salty, etc.) represents something to remember of the Jewish exodus from Egypt and crossing of the desert with Moses.
the seder plate is an important part of it
Yes. Dog food is probably chametz on Passover and may not be owned by a Jew on Passover. Most dogs will happily eat Matzo and meat/chicken on Passover.
The holiday of Pesach (Passover) is one of the most important holidays of the Jewish year.
There are two options for Passover, you can cook food for your pets or you can purchase kosher for Passover pet food. Please see the related link for a list of approved pet foods.
Science Diet dog food does not have chumetz (leaven) in it, but it does have kitnyot (legumes). Since the food is created in a factory that is not supervised for Passover, you should buy the food before Passover so even if there is 1/60 chumetz, you are safe.
Spiders are an important part of the food chain. They get rid of unwanted insects and being food for birds and other animals.
Passover is a Jewish holiday. Holy week is a Christian event.
Because, minerals are actually the most important part of food.
part of a passover meal
The food part i guess
Yes.
Lichens are an important part of the environment. Lichens are a main part of the food source for many animals, and also important for the weathering of rocks.