In food chains, nitrogen isotopes become enriched as one moves higher ... Also, cut marks on fossilized bones confirm that early humans were actively processing meat. Regular meat consumption likely ...

What is a food chain? All living things including humans, animals and plants need energy to live. But, where do they get their energy from? The answer is easy - all living things get their energy ...

Unfortunately, when mercury gets into a food chain, it damages the nervous systems and reproductive systems of mammals, including humans. The diagram shows how mercury can accumulate in the food ...