What is the building block for living things? *
O Carbon
O Hydrogen
O Phosphorous

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred