Category: O-level Biology
Respiration (O-level chemistry)
Respiration This is the oxidation of organic substance to liberate energy in the body. Aerobic respiration requires oxygen whereas anaerobic respiration does not require oxygen. ... Read More
Genetic (O-level biology)
Genetics (O-level) This is a branch of biology that tries to explain the cause of similarities and differences between parents and their offsprings. The first ... Read More