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Excretion in Humans Ankle Injuries Infection Detection Diabetes Immunity in Humans Biological Molecules Cell Review Vision Eyes and Hearing Microbial Growth Oronasal Suctioning Skin Structure The Teeth Anatomy and Physiology Skeletal System Health and Diseases

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Cells, Genetics & Heredity Review › View

Which is a characteristic of most single-celled organisms?

A. They have a complex nervous system.

B. They contain several different types of cells.

C. They perform all life processes.

D. They have a circulatory and a respiratory system.

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Muscles and Movements › View

___ and ___ are regulatory proteins bound to actin. 

A. Troponin and tropomyosin

B. Myosin and actin

C. Calcium and Oxygen

D. Glycogen and hemoglobin

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