The carbon that plants need for photosynthesis comes from (carbon dioxide gas in the atmosphere)
Nitrogenous base pairs would form the rungs of the ladder.
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All organisms, because everything adapts and evolves
Answer:
Geological, chemical, paleontological.
Explanation:
Geological evidence for ice ages comes in various forms, including rock scouring and scratching, glacial moraines, drumlins, valley cutting, and the deposition of till or tillites and glacial erratics.
Successive glaciations tend to distort and erase the geological evidence, making it difficult to interpret.
It took some time for the current theory to be worked out.
There have been at least four major ice ages in the Earth's past.
Paleontological by their bones, remains
