According to scientists, why have organisms on earth become more complex?

Researchers have found evidence which suggests that evolution drives animals to become increasingly more complex.

Explanation: i looked this up

the "dirty dozen" chemicals banned in an international treaty are formally known as persistent organic pollutants, or pops. the united nations environment program provided this background on what they are and what they can do to humans and wildlife.

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rising temperatures because when water vapor in the air is cooled, it condenses. it turns back into a liquid and attaches to dust particles in the air. these very small water droplets group together to form clouds