A. Kidney
It is one of the major organs
Decomposer hope this helps
-clears throat and prepares to sing- our whole universe was in a hot dense steep and nearly 14 billion years ago expansion started..........
Answer:
In uranium-lead dating, for instance, the radioactive decay of uranium into lead proceeds at a reliable rate. Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old.
And that's how after rounding we know that earth is 4.5 years old.
