How does our body change over time? Like what makes a to child grow into adult then old and eventually die ?

Question

Like How cells know that’s it’s right time to develop new kind of cell example responsible for more testosterone production. And if organism survival is only goal of life than why it get old and die.like just regenerate/replace old cells into new ?

In: 4

Answer 1

By age 70, something like 90% of our body’s energy is devoted to producing body hair, moles and odors. Very little energy remains to support the heart, muscles, blood vessels and other critical functions, so we start to look old and then die.