Question
Complete the following sentence: Respiration is __ a chemical reaction that releases oxygen and carbon dioxide. the swapping of gases between an organism and its environment a process that takes in oxygen as a reactant. a process that releases energy from the chemical ethanol.
Answer
4.6
(125 Votes)
Tilly
Advanced · Tutor for 1 years
Answer
C
Explanation
Respiration is a process mainly occurring in the cells where energy is produced. It can be of two types, Aerobic (oxygen-present environment) and Anaerobic (oxygen-less environment). Both processes will have different products but their main aim is energy production. In this context, respiration, essentially involves intake of oxygen (though not always, in case of anaerobic respiration), so option 'A' and 'B' could be ruled out. Option 'C' does correctly establish that 'respiration' typically involves intake of oxygen. Nevertheless, the precise energy source in respiration isn't explicitly ethanol (option 'D') but usually glucose (though other substances may feed into the respiratory pathways in certain circumstances). Therefore, the best and most valid summation is option C, i.e., "a process that takes in oxygen as a reactant."