Protozoa are unicellular eukaryotes that have a single cell in their body. Being unicellular, Protozoans can reproduce through binary fission. During the process, the adult protozoans is divided into two daughter organisms. each of these newly formed organisms attains growth and maturation.
Example: Amoeba is a protozoan that divides by binary fission.
Scientists have determined that Easter Island used to be enormously diverse in biodiversity. Scientists examined the number of bones and pollens that were buried, to support their assumptions. The biodiversity in the past was extremely high in comparison to the biodiversity of Eastern Islands at present.
It now comprises only a few insects and very slight vegetation, however, it is used to be a sub-tropical rain forest. Though, the present levels of biodiversity cannot be illustrated in terms of complexity but instead in the disturbance.
Due to the past populations of the Easter Island, their disturbance on the once paradise is now barren of shrubs and sand, leaving less complexity.
Tracing the roots and looking for the ancestors of protists will be hard because protists are an animal group that has extended really far, which makes things harder when looking for the roots of these organisms. Most of the corrent living organisms are protists, and there are may, manny different families, genus, species, etc. within this group. Tracing the origins and ancestors of the modern day protist would take years. And that is not the only case. Protists have lived on Earth for millions of years, which means that they haved changed and adapted a lot since the first protists appeared.
If two animals for example live in the same territory and feed on the same thing. There will be a competition withing the two predators and one of them will be more successful and increase in population while the other one will decrease.