1 The training course is five weeks. 2  During the first two weeks, students are in the classroom. 3  During the second three weeks, students complete a clinical externship at various Intermountain Healthcare hospitals.
But surprisingly, we still donât know how many species live by the shore: estimates vary widely, from 178,000 species to more than 10 million. NaGISA scientists pulled on their boots and waded and dived in coastal waters around the world to estimate the number of species on our coasts more precisely.
Now, new research published in the journal Nature suggests the world is home to more than 3 trillion trees. Humans throughout history have played a key role in determining the number of living trees, researchers note. People cut down 15 billion trees each year and the global tree count has fallen by 46% since the beginning of human civilization. Previous estimates, collected by satellite imaging, suggested that just over 400 billion trees live around the world.