how many spaces of animals and birds are there in the world
Answers
Explanation:
Everyone wants hard figures, but the fact is that estimating the number of animal species that inhabit our planet is an exercise in educated guesswork. The challenges are numerous.
Species counts are biased by our tendency to study certain organisms more than others. Birds, as a group, have been extensively studied, so scientists believe that the estimated number of bird species alive today (between 9,000 to 10,000) is a relatively good approximation of the actual number. On the other hand, nematodes, also known as roundworms, are a little-studied group of invertebrates and consequently, we have little grasp of how diverse they may be.Habitat can make counting animals difficult. Animals that live in the deep sea are not easy to access, so naturalists have less understanding of their diversity. Organisms that inhabit the soil or parasitize other animals are likewise challenging to locate and therefore difficult to quantify. Even terrestrial habitats, like the Amazon rainforest, can present insurmountable obstacles to a species census.
Animal size often complicates the detection and counting of species. In many instances, the smaller species are more difficult to find and count.
Ambiguities in terminology and scientific classification affect species counts. How do you define a species? It's not always easy, especially when supposed "species" are capable of cross-breeding. Additionally, different approaches to classification influence species counts. For example, some models classify birds as reptiles, thus boosting the species count of reptiles by as much as 10,000.
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Answer:
animals species are 8.7 million
and birds 9,000 and 10.000
Explanation:
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