What is the main function of these organs? A. To take in oxygen and remove carbon dioxide
B. To eat and break down food
C. To transport materials to and from body cells
D. To see and help the body respond to the environment
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Is snow a type of precipitation? explain why or why not.

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

The picture showed normal blood cells which are around and sickle cells which appear much longer people with sickle-cell suffer from the sickle cell anemia which is inherited diseaseit is caused by a change in gene responsible for production of hemo goblin this type of change is known as an