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fish
They need fish.
The animal they most rely on is the fish because they made spears and canoes making it easy to catch fish. It also was easy to make and was one of their favorite.
Fish, mosquitoes, algae
Fish are cold-blooded animals because they cannot control their own body temperature. They rely on the environment to control it.
When it's gets rely fat or eats too much
Amphibians and fish are both vertebrates which rely on water for their reproductive cycle.
Predators of X-ray fish include larger fish, birds, and mammals that prey on smaller fish in their habitat. These predators rely on their keen senses to detect and capture X-ray fish as a source of food.
Without venom to knock out the fish they intend to eat they would get awfully hungry because they are not well adapted to holding onto a slippery struggling fish.
Most larger fish are predator types, feeding on a range of foods such as other fish, crustaceans, mollusks, etc. Some rely solely on vegetative matter such as algae and plants. Some require or prefer both.
John Dory eat a variety of small schooling fish. The are poor swimming and rely on the element of surprise to catch their prey.
Yes, fish are heterotrophic organisms because they cannot produce their own food through photosynthesis. They rely on consuming other organisms or organic matter to obtain the energy and nutrients they need to survive.