Yeast is a facultative anaerobe. this means that alcohol fermentation takes place only if:
the temperature is close to 37â°c
the atmosphere does not contain oxygen
sugar is provided to the cells
light is provided to the cells

c

explanation:

age range would be the answer

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.