There have been five mass extinctions in Earths history There’s a natural background rate to the timing and frequency of extinctions: 10% of species are lost every million years, 30% every 10 million years, and 65% every 100 million years 2 It would be wrong to assume that species going extinct is out of line with what we would expect
The world’s population is now 8 billion. Is that too many . . . The total number of elderly is projected to reach 80 million by 2040 and nearly 95 million by 2060 That means more people beyond the traditional working age, and fewer younger workers to support
Malaria - World Health Organization (WHO) According to the latest World malaria report, there were 263 million cases of malaria in 2023 compared to 252 million cases in 2022 The estimated number of malaria deaths stood at 597 000 in 2023 compared to 600 000 in 2022 The WHO African Region continues to carry a disproportionately high share of the global malaria burden
Solved 8,000-1 6,000 Number of genera 4,000 2,000 0 0 50 150 . . . Given this yearly rate, the background extinction rate for a century (100-year period) can be calculated: 100 years per century x 0 0000001 extinctions per year = 0 00001 extinctions per century Suppose the number of mammal and bird species in existence from 1850 to 1950 has been estimated to be 18,000
quiz 16 Flashcards | Quizlet Study with Quizlet and memorize flashcards containing terms like Scientists have used the fossil record to estimate the average length of time that a species inhabits Earth How can this estimate assess the impact of humans on Earth's biological diversity?, Approximately 200 of the 300 native fish species in Lake Victoria haven't been observed since the 1960s and are therefore probably extinct
Plants make our existence possible - Raven - 2021 - PLANTS . . . Over the past 66 million years, we have lost about 0 1 species per million per year in those hard-bodied groups that we can sample adequately (essentially terrestrial vertebrates and mollusks) By comparison, we estimate that current extinction rates have already reached about 1,000 times the historical ones (De Vos et al , 2014; Pimm et al