Unicellular protozoa
uni/multicellular
algae
multicellular
heterotroph
cell walls chitin
multiceullular
autotroph
cell walls
of cellulose
multicellular
heterotroph
lack cell walls
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what domain name should replace the question mark in this chart?
archaea
bacteria
eukarya
monera

eukaria

Explanation:

it is a biological taxonomy that includes all you said in your question

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.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.