Eli5: How does a microscopic sperm after fertilization can form so many complex Organs and chemicals, as atoms can’t be created nor destroyed? Also if neurons can’t divide, how did it came into existence in the first place?

Question

Eli5: How does a microscopic sperm after fertilization can form so many complex Organs and chemicals, as atoms can’t be created nor destroyed? Also if neurons can’t divide, how did it came into existence in the first place?

In: Biology

Answer 1

How can it form so many different things?

DNA is like an instruction manual on how to form all those things.

How can it grow if atoms can’t be created or destroyed?

Because after the sperm fertilizes the egg, that zygote (the combination of the two) implants itself into the wall of the mothers uterus, there it absorbs nutrients from the mother and uses that to grow.

Neurons dividing?

You’re right (most) neurons can not divide. Instead there are other special cells in charge of making neurons. Kind of like a factory pumping out new neurons to grow.