Various kinds of variations in life forms such as:

1) Variation in terms of size: microscopic bacteria are few micrometre in size while, on the other hand blue whale and red wood trees of california are approximate 30 metres and 100 metres in size repectively.

2) Variation in terms of age: Pine trees live for thousands of years while insects like mosquitoes die within a few days.

3) Variation in terms of colours: Worm are colourless or even transparent, on the other hand birds and flowers are brightly coloured.