Examlex
Which of the following abilities marks the end of the sensorimotor period?
Eukaryotic Cell Fossil
Preserved remnants of ancient eukaryotic cells, which possess membrane-bound organelles, including a nucleus.
Biomarker
A biological molecule found in blood, other body fluids, or tissues that is a sign of a normal or abnormal process, or of a condition or disease.
Steroids
Organic compounds with a characteristic molecular structure containing four rings of carbon atoms; includes some hormones and vitamins.
Organic Compounds
Chemical compounds containing carbon atoms bonded to hydrogen atoms, often along with other elements, which are the basis of all life on Earth.
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