Which kingdom is made up of mostly, but not exclusively, unicellular organisms?
plantae
archaea
animalia
protista

The correct answer would be protista.

Explanation:

The kingdom Protista includes the unicellular eukaryotes. Protists are a diverse kingdom of living beings that are mostly unicellular but some are multicellular. These multicellular organism does not show highly specialized tissues organization.

They show similar characteristics to animals, plants or fungi. Protists can be heterotrophic or autotrophic such as algae, kelp, Paramecium.

Thus, the correct answer is Protista

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.