since the appearance of terrestrial creatures so aquatic creatures can be completely disappeared

The existence of terrestrial creatures does not make aquatic creatures any less important or significant to the ecosystem. In fact, the disappearance of aquatic creatures would have a profound impact on the planet and all life forms, including humans. Here are some key points to consider:

1. Biodiversity Loss: Life on Earth is incredibly diverse, with millions of species inhabiting aquatic environments. Eliminating these species would result in an unprecedented loss of biodiversity.

2. Ecosystem Collapse: Aquatic ecosystems, such as oceans, lakes, and rivers, play crucial roles in maintaining global ecological balance. The disappearance of aquatic creatures could lead to the collapse of these ecosystems, with cascading effects on the entire planet.

3. Impact on Food Chains: Many aquatic species are primary producers or form the base of the food chain. Their absence would disrupt food chains and threaten the survival of numerous other species, both aquatic and terrestrial.

4. Oxygen Production: Aquatic organisms, particularly photosynthesizing microorganisms like phytoplankton, produce a significant portion of the Earth's oxygen. Without them, oxygen levels would decline, threatening all aerobic life.

5. Carbon Storage: Aquatic ecosystems, especially oceans, absorb large amounts of carbon dioxide from the atmosphere. This helps regulate climate and mitigate the impacts of climate change. Losing these ecosystems could exacerbate global warming.

6. Disruption of Nutrient Cycles: Aquatic ecosystems play a vital role in nutrient cycling, such as nitrogen and phosphorus cycles. Their disappearance would disrupt these cycles, affecting both aquatic and terrestrial ecosystems.

7. Loss of Economic Resources: Aquatic resources are essential for many industries, including fisheries, tourism, and shipping. Losing aquatic creatures would have severe economic consequences for societies around the world.

8. Cultural and Spiritual Significance: For many cultures, aquatic environments and the creatures that inhabit them hold deep cultural or spiritual significance. Their disappearance would have profound impacts on these communities.

9. Loss of Medical Discoveries: Many medical discoveries and treatments have been derived from aquatic organisms. Losing these species could hinder future medical breakthroughs.

10. Ecological Interdependence: Terrestrial and aquatic ecosystems are interconnected in various ways, such as through water cycles, nutrient transport, and migration patterns. The disappearance of aquatic creatures would disrupt these connections, with unknown consequences for terrestrial ecosystems.

In summary, the existence of terrestrial creatures does not diminish the importance of aquatic creatures. Both groups of organisms play vital roles in maintaining the health, diversity, and resilience of our planet. The disappearance of either group would have far-reaching and potentially devastating consequences for the entire web of life.