Final answer:
Eustatic worldwide changes refer to changes in global sea level due to changes in the volume of water in the oceans versus ice sheets. These changes can be both short-term and long-term.
Step-by-step explanation:
Eustatic worldwide changes refer to changes in global sea level due to changes in the volume of water in the oceans versus ice sheets. These changes can be both short-term and long-term. Short-term changes can include melting of glaciers, unseasonal rainfall, and changes in the life cycle of insects and animals. Long-term changes can include a rise in levels of water bodies, which may cover islands close to sea level, destroying the local ecosystem.