Select the correct answer.
which is the function of bone?
a.
production of muscle cells
b.
production of blood cells
c.
production of nerve cells
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The body is protected against harmful flu viruses by

Describe two recent or ongoing space missions.

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land