What is unique about the protein channels which allow
molecules to travel by
facilitated diffusion?

A. Each channel only allows one type of molecule to pass through it

B. The channels modify the molecule's DNA as they pass through

C. The channels move molecules very quickly

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How do you date a sample of rock that you suspect as being one of the earliest on earth

Which statement correctly describes other ways in which nebulae and stars are different? a. a star always has a higher density than a nebula. b. stars can form inside a nebula but a nebula can never be produced by any star. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star. reset submit

These are the components of the reservoirs of carbon that are exchanged in our environment.