The IUCN's Red List is .A. a list of unidentified speciesB. an updated list of species facing unusually high risk of extinctionC. a scorecard of international failures at conservationD. an identification list of known speciesE. a list of ecologically damaged ecosystems

B. an updated list of species facing unusually high risk of extinction

Explanation:

The IUCN red list is used to find out the status of biodiversity. The IUCN red list of threatened species is an updated list of those species who are facing a high risk of extinction.

This list allows the wildlife conservationist, ecologist to know the current status of the biodiversity of the world and make ways to prevent or slow the extinction of these species. More than 112,400 species are currently present under this red list which includes species of mammals, amphibians, birds, corals, etc. Therefore the correct answer is B.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.