U·ni·cel·lu·laradjective
BIOLOGY(of protozoans, certain algae and spores, etc.) consisting of a single cell.(of an evolutionary or developmental stage) characterized by the formation or presence of a single cell or cells.
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Explanation:
Two characteristics are used to define the mammal class. They are mammary glands and body hair (or fur). Female mammals have mammary glands.
They are found in the body for the cell division and they are also found in the respiratory
Answer:
B. younger than the sedimentary rock.