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the tube through which urine passes from the bladder to the exterior.
two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to...
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
minute pores in the epidermis of a leaf or stem which allows for movement of gases and water...
all the ecosystems on the Earth, all the species within these ecosystems and the genetic...