4. Why is water essential to living things? (1 point) Water is essential because it is an inorganic compound.
Water is essential because it contains hydrogen and oxygen atoms.
Water is essential to many of the chemical reactions that occur in the body,
Water is essential because, without it, people would have no fish to eat, and they could not get the protein that they need.

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Which sentence is an example of a strong conclusion to an autobiography? a. i stayed after school three days in a row to practice onstage in the auditorium. b. i knew i would have to practice all week to memorize my dance for the recital. c. after the recital was over, i knew practicing was worth it, and i was looking forward to my next big challenge. d. on opening night, i danced in front of a packed auditorium.

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