Biodiversity crossword

the dying out of a species
the variety of life in the world or in a particular ecosystem
the total # of genetic characteristics in the genetic makeup of a species
a loss of about 3 quarters of all species in existence on the entire Earth in a “short” geological period of time
when a species declines in #'s gradually but steadily at the end of its evolutionary period on Earth
harvesting species from the wild at rates faster than natural populations can recover
a threat to arctic biodiversity and wilderness
changes in population or community structures that occur at the boundary of 2 or more habitats
where toxic substances move up the food chain and become more concentrated at each level
undue richness of nutrients in a body of water
an organism that is not native to the place and has been accidentally or deliberately transported to the new location by human activity