Aquatic ecosysterms cover approximately how much of the earth's surface ?

How much of the Earth's land surface is desert ?

State whether True or False: Desert covers approximately one fifth of the earth surface.

……… covers more than 70% of the earth's surface.

All biodiversity hotspots put together cover about how much percent of the earth's land area ?

All biodiversity hotspots put together cover about how much percent of the earth's land area ?

All biodiversity hotspots put together cover about how much percent of the earth's land area ?

All biodiversity hotspots put together cover about how much percent of the earth's land area ?

According to conservation biologists, how much of the earth's land surface should be strictly protected ?