[I picked d.]
How many species are estimated to be living on earth?
a.between 10,000 and 1,000,000
b.between 500,000 and 1 million
c.between 1 and 5 million
d.between 10 and 50 million
http://faculty.plattsburgh.edu/thomas.wolosz/howmanysp.htm
This is a political, not scientfic number. The more species one has, the more become endangered. d is probably the most cited number in political circles, but upwards to 200 million are commonplace in scientific estimates.
To determine the estimate of how many species are estimated to be living on Earth, we can refer to scientific sources. The website you provided mentions that the numbers given in the options are political estimates rather than scientific ones. However, for the purpose of answering your question, we can still provide an explanation.
The given options are:
a. between 10,000 and 1,000,000
b. between 500,000 and 1 million
c. between 1 and 5 million
d. between 10 and 50 million
According to the source you provided, option d (between 10 and 50 million) is the most commonly cited political estimate. However, it is mentioned that scientific estimates can go as high as 200 million.
To get a more accurate estimate, it is important to consult scientific literature and research. Scientists estimate the number of species by studying different ecosystems, conducting field surveys, and using statistical models. This estimate is often challenging due to the vastness and complexity of Earth's ecosystems.
While the exact number of species on Earth may never be known with absolute certainty, it is generally agreed upon that there are likely millions of species, potentially even reaching hundreds of millions.
For a more precise answer to this question, it is recommended to consult reputable scientific sources or research papers that focus on biodiversity and species estimation.