What are some characteristics that protists and fungi both have that make them eukaryotes?

They have a nucleus and other membrane bound organelles.

Explanation:

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b is the best answer for this question.

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).