Question

1. there would be no life in the oceans without organisms called ______

phytoplankton (tiny plants)
decomposers
consumers
zooplankton (tiny animals)

Explanation:

Phytoplankton are primary producers in the ocean. Through photosynthesis, they convert sunlight into energy and produce oxygen, forming the base of the oceanic food - web. Without them, the entire oceanic ecosystem would collapse as other organisms rely on them for food and oxygen.

Answer:

Phytoplankton (tiny plants)