Ethan deternines that layer B is 3.5 million years old due to the

Explain how the political influence of african americans leaders became weaker.

Why does bubbling occur when vinegar mixed with baking soda

Which statements explains what the fossil records indicates? check all that apply. a) earth is 4.5 billion years old b) many organisms have become extinct c) mammals have always existed on earth d) mass extinctions have occurred several times on earth e) the amount of water on earth has decreased over time?