a) FALSE. The breakdown of glucose into carbon dioxide and energy is done using oxygen inside the cell. This process is known as respiration.
b) TRUE. Likewise humans frogs also can respire through lungs. In addition to lungs frogs can also respire through their skin which is thin, moist and slimy and help in easy gaseous exchange.
c) FALSE. Spiracles are the tiny pores present in the insects like cockroaches which help in gaseous exchange. These small spiracles are present on the lateral body (sides) of the organism.
d) TRUE. The percentage of CO2 in inhaled air is 0.04% whereas in exhaled air it is 4.4%. Therefore, we can say that exhaled air has more percentage of carbon dioxide than in the inhaled air.
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