Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now experiencing an extinction (loss of biodiversity) crisis?
A) Humans are ethically responsible for protecting endangered species.
B) Scientists have finally identified most of the species on Earth and are thus able to quantify the number of species becoming extinct.
C) The current rate of extinction is high and human activities threaten biodiversity at all levels.
D) Humans have greater medical needs than at any other time in history, and many potential medicinal compounds are being lost as plant species become extinct.
E) Most biodiversity hot spots have been destroyed by recent ecological disasters.
The phenomenon of osmosis.
Species richness of birds in North America.
The Eastern Banjo Frog is a common frog species across eastern Australia.
A day-flying Hummingbird Hawkmoth drinking nectar from a species of Dianthus
Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
Beer is made from the fermentation of yeast and the natural sugars from grains