Answer:
So far scientists have not found a way to find the exact age of the Earth directly from Earth rocks because Earth's oldest rocks have been recycled and destroyed by the process of plate tectonics. Ancient rocks exceeding 3.5 billion years in age are found on all of Earth's continents
Explanation:
Its chordata phylum
beacuse with currently about 64000 species described as chordata phylum
Answer:
Hibernation, Burrowing underground