Explanation

Biochemical Similarities between Groups The different types of biochemical reactions occur in every living organism. These reactions are same in all the living organisms. Some of the chemicals and their reactions are (i) Enzymes The amylase in all the living organisms digests the carbohydrates. The trypsin in all the living organisms digests the proteins. (ii) Hormones In frog, the metamorphosing hormone is thyroxin. If human thyroxin is injected into thyroid free tadpole larva, if undergoes metamorphosis. This indicates that the function of thyroxin is same in all animals. (iii) Haemoglobin It carries oxygen and carbon dioxide in all animals. Haemoglobin carries oxygen in the form of oxyhaemoglobin. In all birds the oxyhaemoglobin is identical. This indicates that the birds have close relationship among themselves