Which of the following increases in muscle cells when they are lacking in oxygen?

In one of the following organisms, the gaseous exchange during respiration does not take place through cell membrane/skin. This organism is:

Which of the following is correct for the process of anaerobic respiration?

Carbon dioxide A lot of energy always produced released

Internal respiration may be defined as:

When air is blown from mouth into a test-tube containing lime water, the lime water turns milky due to the presence of :