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Species-rich floras of chalk grassland compared to species-poor floras of acid soils.
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
Endangered species
In one-male group species, extra males typically reside in all-male “bachelor” groups. These are Han
Early geologists discovered evidence of past glaciations in U-shaped valleys
Life cycle of a Plasmodium species that causes malaria