Energy flows up a food chain, from the primary producers to the primary consumers, to the secondary consumers, up to the tertiary and then quaternary consumers. Energy flows when one organism eats another lower in the food chain, the energy is transferred by heat and movement, some though is lost. They eat each other but it only gets half the energy stored. A food web is similar - it is just a series of food chains.
A group of freshwater drums spawning in the same area.
If you push ice together slowly after awhile the pressure from the ice being pushed together will make the ice crack and break.
