“Sometimes people take for granted that because scorpions are born from heaps of rice, the rice has produced the scorpions. The real fact, however, is this: the mother scorpion lays eggs within the rice, and by the proper fermentation of the rice the eggs give birth to several baby scorpions, which in due course come out. This does not mean that the rice gives birth to the scorpions. Similarly, sometimes bugs are seen to come from dirty beds. This does not mean, however, that the beds give birth to the bugs. It is the living soul that comes forth, taking advantage of the dirty condition of the bed. There are different kinds of living creatures. Some of them come from embryos, some from eggs and some from the fermentation of perspiration. Different living creatures have different sources of appearance, but one should not conclude that matter produces such living creatures.
“The example cited by materialists that trees automatically come from the earth follows the same principle. Taking advantage of a certain condition, a living entity comes from the earth. According to the Bṛhad-āraṇyaka Upaniṣad, every living being is forced by divine superintendence to take a certain type of body according to his past deeds. There are many varieties of bodies, and because of a divine arrangement a living entity takes bodies of different shapes.
Ref >> Srila Prabhupada Vani.