There are several problems with classifying organisms into six kingdoms of life. one problem is that aren't well defined and are very diverse. in addition, any eukaryotes that don't fit into other kingdoms are placed in this kingdom. a. fungi b. plants c. archaea d. protists

D. Protists

Explanation:

Kingdom protista is composed of mostly unicellular organisms, but they do include some multicellular organisms. Like your problem says, eukaryotes that do not fit in other kingdoms are placed in this kingdom. As a result, even members of this kingdom do not share many similarities, as the organisms here are diverse.

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.