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How do ecologists estimate the total number of species present in the world?
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How do scientist estimate the number of nucleotide changes that have taken places in a gene since two species diverged from a common ancestor?
Both organisms' DNA is sequenced, and then compared to one another. The number of nucleotide changes is literally counted (though with a computer). It is an estimate because of genetic diversity within a species
What is the most effective way to protect species?
The most effective and the only way for protecting species (including human-specie) is to become wise and transition to human-consciousness. Present humankind is living in animal-consciousness, and it is trying to emulate the model of animals for itself. ANSWER The most effective way to preserve species is to drastically reduce the number of the species killing all the others - humans.
How do ecologists find out the numbers of each animal?
Ecologists sample areas in the environment they wish to study to work out a vague idea of the numbers of different species in their habitat. 4 methods of sampling are used; Quadrats, Random sampling, Systematic sampling using transects and the Lincoln index (mark-release-recapture). For mobile animals the best method is the Lincoln index which is an estimation of population size using to samples of the area. First they sample the area capturing the species they desire and mark them with a non toxic marker. After a suitable period of time they re sample the area. Estimated population size = Number of individuals caught in 1st sample * Number of individuals caught in 2nd sample/total number of individuals re caught from 1st sample in the 2nd sample. Assumptions must be made for the whole sample and statistical tests must be used to detect any factor that would have an effect on the results e.g. chance.
Did Charles Darwin make an enormous number of species inhabit earth?
No, he recognised that species evolve into new species.
Do vertebrates have the greatest number of species?
Yes
Why do ecologists use the technique of sampling to estimate population size?
In many cases, it is not even possible to count signs of every member of a population. The population may be very large or spread over a wide area. In such cases ecologists usually make an estimate. An estimate is an approximation of number, based on reasonable assumptions.
How do ecologists measure population density?
By taking a sample of the entire population.
Describe how to measure species richness and species evenness. (supplemental resource?
species richness is the total number of species present if there are 4 species present and 5 of each then the species richness is 4 as there is 4 types of species while the species evenness is 5 a species eveness is the relative abundance of each species.
Which species are least likely to be vital parts of a present day ecosystem?
The answer is number 3. Species E and J
What is the smallest number of species that can be present in a food chain that includes a carnivore?
four
Florida ecologists sampled Lake George to estimate the number of rainbow trout in the lake Out of 156 fish 18 were rainbow trout About how many rainbow trout should they expect to find in a sample500?
57
How are a population and community different?
A population biologist studies the number(s) of species as they increase or decline in relation to their density or some environmental factor. Community ecologists study the numbers and interactions of all the species in a given location.
How could you show the number of species of insect without graphing the actul number. the specious of insect are 1000000?
If you wanted to show the number of insect species, you would have to have a lot of time and a huge area to present the material. This is because there are hundreds of thousands of different species.
How many different species of snake are there in the whole world?
Figures vary greatly - a conservative estimate puts the number of individual species at around 2,500.
How many different types of animation are there?
There are currently about 1.4 million identified animal species, and about 1 million of them are insects. Biologists estimate the number of animal species could be as many as 5 million.The total of living plant and animal species is estimated as 8.7 million species. This does not include bacteria which could number in the hundreds of millions of species and subspecies.
Why germinal layers are not present in animals?
the animals having same number of chromosomes but members of different species why?
How many different types of millipedes?
Although the exact number of centipedes on earth is unknown, there is an estimate of the number of species. Worldwide there are estimated to be about 8,000 species living today.
