Biology
Out of 900 reported species of living gymnosperms, conifers are represented by about 500 species, About 2,50,000 species of angiosperms (flowering plants) have also been reported in the world. The vast and dominant woodlands in Europe, Asia, North America and mountains such as Himalayas are wooded with

only angiosperms
all gymnosperms, except conifers
only conifers
angiosperms and all gymnosperms except conifers

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Biology
Function of pace maker is

To regulate the formation of urine
To regulate the process of digestion
To initiate heart beat
To start the process of respiration

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