Long ago, there was one generic type of bear. Now, because of divergent evolution, there is a brown bear and a polar bear, each adapted to their own environment.
Another example is the famous finch observations that Charles Darwin made. He has discovered that through geographical isolations, speciation has divided the finch into various species of finches.
Some people say the Galapagos finches are an exampled of natural selection because their beaks change in size about five percent a year depending on the season. Their beaks then change back to regular size later in the year. This was Darwin's main exampled when he came up with the theory of evolution. However, it has recently been discovered the change in beak size is simply an adaptation. The finches have different food available different times of the year so the change in the beak size is a very simple adaptation that plays no roll in the process of natural selection. There really are no examples because scientists have never found any proof in the fossil records of animals "evolving."
One way that a new species can be formed is through a genetic mutation. If an organism is born with a mutation, this mutation can either be detrimental or beneficial. If the mutation is detrimental, the organism will more than likely die, or at the very least be less likely to reproduce. If the genetic mutation is beneficial, however, this can increase the organisms chance of survival and reproduction (an example of a beneficial mutation would be one in which the organism becomes better fitted to survive in a certain habitat). When the mutated organism reproduces, their genetic mutation will more than likely be passed on to the next generation. Through time, this can give rise to an entirely new species.
Dogs, Whales and Penguins are all examples of this.
The formation of a new species.
Big groups of mushrooms could be morels, reishi, crocodile agaricus, or other species.
Either desert-dwelling or marsh-dwelling species.
Some organisms have adapted to their environment through evolution. These species went through slow changes so that they could survive where they are. In some cases, the environment changed around them slowly and they went through changes. This is what happened to many species in the deeper regions of the ocean.
No. Evolution is a consequence of selective pressure(s) from the environment acting on organisms. Virtually all living beings are not conscious of this process.The only species that *could* consciously direct its own evolution is Homo sapiens (humans), but currently it doesn't.Artificial selection can and has consciously directed evolution, but it always was a species acting over other different species, not on their own evolution.
The introduction of a new predator, the spread of a new disease, the introduction of a toxic substance, or the elimination of a food source are all examples of environmental changes that could affect the survival of a species.
a few examples could be:Death Cap mushroom and psylocybe mushroom, are both dangerous to humans.Some yeast is dangerous to many species.Mold spores can be harmful to many organisms.
Single celled organisms are examples of living cells that are organisms. Most other living cells are parts of living organisms, but could not survive long on their own.
Many animals would have to change habitats, and it could affect the population of a species in an area. It could also affect the attitude of inhabiting organisms towards outside organisms, which could also affect the population. I hope this helps!
Yes, a species is a category used in biological classification to group together organisms that have similar characteristics and can interbreed to produce fertile offspring. Members of the same species are considered to be more closely related to each other than to members of other species.
Fossil species cannot be defined with the genetic definition. But then that's also true of most of the species that biologists define among living organisms.
A taxon is a group of organisms in a classification system, such as a species, genus, family, or order. Taxonomy is the science of classifying and naming organisms based on their characteristics and evolutionary relationships. Each taxon represents a level in the hierarchy of biological classification.
Aside from artificial selection humans are a large part of all other organisms environments. So, any barriers humans erect could bring about allopactric speciation, though I can not think of any specific examples there. Also, human caused extinctions can cause adaptive radiation of a species into the niche of a species driven extinct by humans.
could be supported by a girven environment indefinitely
Big groups of mushrooms could be morels, reishi, crocodile agaricus, or other species.
Either desert-dwelling or marsh-dwelling species.
Concept Attainment is a good model for teaching the taxonomic classification system in science. The Animal Kingdom could be used as a concept, for example, and characteristics of it could be given as well as examples of animals and examples of organisms that are not animals.
Scientists believe there are around 8.7 millions species on Earth, but this number could be off by 1.3 million either way. It is estimated there are 6.5 million land species and 2.2 species in the oceans.