1
ONE
There is excessive cutting of tress
in Himalayan region. Grezing of animals
is on an ebb. Human intreruption is
increasing. Can you tell which disaster
do these activities add to?
TWO
THE
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be- fore Barnes
Ten years be- fore Barnes (1893) coined the term 'photosynthesis,' Theodor Engelmann (1883) reported novel experi- ments that revealed photosensory behavior of purple sulfur bacteria (see description in Gest 1995).
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