On earth, energy? a.) cycles back and fourth through many systems. b.) comes in as light and leaves as heat. c.) comes in as heat and leaves as as light. d.) is constantly destroyed and must be regenerated.

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.

i hope this

i'm guessing this is from edg enuity so the answers would be, from top to bottom,

theodor schwann

matthias schleiden

robert hooke

rudolph virchow

anton van leeuwenhoek

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