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Could there be two different girls who look the same?

I decided to clear-cut all the trees in Washington to make lumber for houses and wood pulp for newspapers. Resources: There are no more trees in Washington. So next time I'm looking for trees, I'll have to look elsewhere. Biodiversity: All the trees are gone (there were lots of species)...

Get hold of the textbook and judge for yourself. Amazon or Ebay will have a copy for sale (but not the teachers' edition). Talk to the teacher. But here I need to caution you: you are going to need trigonometry later in life. If you aren't learning it in class, you'd better grab that...

> Is there a non living thing that responds to their environment? Plenty. Fire is a good example -- moves in the direction of combustibles, consumes combustibles, moves on, moves in response to wind. > are any non-living things made up of cells? Depends on your definition of cell, now...

I have a Schwinn Collegiate bicycle, circa 1974. What chain size do I need to get for that? Where do I get the chain? How do I put the chain on?

Depends on your predator. Most of them will maintain or increase biodiversity, and be in balance with their ecosystems. Superpredators like humans and Tyrannosaurus rex decrease biodiversity by hunting some prey animals to local extinction, and by eliminating competing predators.