安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
|
- Earth BioGenome Project to Sequence All Life | UC Davis
The ambitious project will take 10 years to complete and cost an estimated $4 7 billion Of the estimated 15 million eukaryotic species, only 10 percent have been taxonomically classified Of that percentage, scientists have sequenced the genomes of around 15,000 species, less than 0 1 percent of all life on Earth
- We Depend on Plastic. Now We’re Drowning in It. | National . . .
World production has increased exponentially—from 2 3 million tons in 1950, it grew to 162 million in 1993 and to 448 million by 2015—but the amount of plastic drifting on the ocean and
- Science Trek - Science Trek
The diversity of life is one reason Earth is such an interesting place! How many different living things can you name? Scientists have identified 1 7 million different species on Earth, but they estimate there are at least 10 million species yet to be discovered
- How many species are there? | Biodiversity and Conservation
‘How many species are there’ is a question receiving more attention from biologists and reasons for this are suggested Different methods of answering this question are examined and include: counting all species; extrapolations from known faunas and regions; extrapolations from samples; methods using ecological models; censusing taxonomists' views Most of these methods indicate that
- Extinction looms for many species, study finds - USA TODAY
Permian-triassic: 250 million years ago A range of species, including many vertebrates Cretaceous-tertiary Extinction: 65 million years ago An estimated 50% of Earth’s plants and animals
- How many undiscovered creatures are there in the ocean?
The very high estimates (any larger than 10m) are now thought unlikely by many, but current common estimates still vary between around 0 3m and 2m marine species New way of recording species
- The abundance, biomass, and distribution of ants on Earth
Adding up our estimates of epigaeic, arboreal, and nonforaging ants (see Materials and Methods), we estimate the number of all ants on Earth at any given time to be 19 8 × 10 15 (±5 × 10 15), i e , ∼20 quadrillion, individuals with a total dry biomass of 12 3 (±3 1) Mt C (Fig 2B)
|
|
|