One technique used to check ecosystem health and biodiversity of an ecosystem is to monitor populations of native species and in
troduced species. Native species are species that were present in an ecosystem before humans began altering it. Generally, the more native species that are present, the healthier the ecosystem. Introduced species are species that humans bring into an ecosystem from other ecosystems. Introduced species can become invasive species if they outcompete native species for local resources. In some cases, invasive species can cause native species to disappear from an ecosystem, or even to become extinct. Some invasive species can even become the only species of its kind in an ecosystem, which greatly reduces biodiversity. Based on this information, which of the following ecosystems is the healthiest and most diverse?
Threats to Native Wildlife. Invasive species cause harm to wildlife in many ways. When a new and aggressive species is introduced into an ecosystem, it may not have any natural predators or controls. ... Invasive species can also alter the abundance or diversity of species that are important habitat for native wildlife.
The connective tissues of mammalian brain is called the meninges. There are three layers of this tissue. The outer layer is called the dura mater. The arachnoid is the middle layer and the pia mater is the inner layer of it.
In population genetics, the term evolution is defined as a change in the frequency of an allele in a population. ... The allele frequency within a given population can change depending on environmental factors; therefore, certain alleles become more widespread than others during the process of natural selection.
