Answer:
Nonliving things
1. Rocks, sand, gravel and dirt parts
how they interact with each other
2. reef-building corals have a symbiotic relationship with photosynthetic algae called zooxanthellae, which live in their tissues. ... The algae also help the coral remove waste. Since both partners benefit from association, this type of symbiosis is called mutualism
Relationship of Big and small fish
3. Third trophic level of a pyramid. In a water ecosystem, big fish eats a small fish which eats water fleas supported by phytoplankton. In this, phytoplankton are producers, water fleas are primary consumers, small fishes are secondary consumers and big fishes are top consumers.
Worms in fish guts (Parasites)
4. Fish get infected with parasites when they feed on intermediate hosts. The definitive host for fish roundworms are marine mammals like seals and dolphins and birds that feed on fish like cormorants and seagulls. These hosts shed eggs in their faeces which hatch into larvae in the water.
Explanation:
Your answer on 5 varies
