Biology
It is the branch of biology which deals with the study of relationship between organisms and their environment.

Ecology
Genetics
Evolution
Taxonomy

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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
angiosperms and all gymnosperms except conifers
only conifers

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