Select your answer:

Topics:
Respiratory and Circulatory Life Cycle - Bee Characteristics of Life & Viruses Heart Vocab and Blood Flow Pathway Urinary System and Fluid Balance Bacteria & Viruses Digestive System Thyroid Respiration Excretory and Musculoskeletal System Biocomposite Muscle System Mutation & Genetic Engineering Warm up Immune ResponseOther quiz:
Eye Physiology › ViewWhen light hits the retina, the _________ are stimulated.
A. sclera
B. optic disk
C. photoreceptors
D. choroid coat
Living Organisms › View
Miranda learned how the human body carries out life functions. Which is the MOST basic level of organization in the human body?
A. an organ
B. a system
C. a tissue
D. a cell