Evolution

It isdifficult because there is no 100% way to know, and many other theories have been discussed. Evolution is the primary theory of the start and progression of life because the fossil evidence found all over the world. DNA evidence has also shown strong links between various organisms, proving that the organisms may share a common ancestor, but that the species evolved over time.

As you can see, there is for sure evidence.

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There are several books and websites that detail human evolution. Seeing as how modern humans are descended from 4 different ancient hominids, its difficult to discuss when Homo Sapien officially began. We are descended from Homo Erectus, Homo Denisova, Homo Neanderthalensis, and Homo floresiensis. Those 4 species interbred and formed what became the modern human or Homo Sapien.

Monkeys do not directly evolve into humans. However, humans and monkeys do share a common ancestor. Over millions of years, evolutionary processes led to the development of different species, with humans evolving separately from monkeys. The evolutionary path that led to modern humans involved significant changes in brain size, tool use, and social behavior.

When oxygen levels rose on Earth, it resulted in the diversification and expansion of oxygen-dependent organisms, including the development of more complex life forms. This increase in oxygen levels formed the basis for the evolution of aerobic respiration and allowed for the colonization of new ecological niches. However, these changes may have also put pressure on anaerobic organisms, leading to their decline in certain environments.

To chose the most genetically superior mate she can, and/or a mate who will help her raise the offspring. To reject all mates that carry too large a parasite load and, depending on theory, the mate that will make her male children attractive to future mates, or the genetically superior mate, though these criteria are not mutually exclusive.

Possibly as much as 200,000 years ago and perhaps as little as 100,000 years ago.

Sexual selection, which is the process by which certain traits are favored for reproduction, can indeed lead to violence in some species. In some cases, competition over mates can result in aggressive behaviors such as fighting or intimidation. However, it is important to note that not all forms of sexual selection result in violence, and many species have alternative strategies for mate selection that do not involve aggression.

Yes, and they still do. Birds are now recognized as the only living dinosaurs. Aside from that, no. Non-avian dinosaurs died out long before the first humans walked the Earth.

Over time, horses have evolved to be taller - the original 'horse' from just after the extinction of the dinosaurs was about the size of a beagle. Also, horses used to have five toes. Over the millenia horses have dropped from five toes, to three, to the one seen today.

" Missing link " is a misnomer coined by ignorant journalists who know nothing about evolutionary processes. All organisms are transitional and there are no links because evolutionary processes are not linear, but more bush like in appearance. We have common ancestors, not linked-in-a-line ancestors

In evolution the study of vertebrate forelimbs is related to the anatomical evidence from homology.

No. Bird and insect anatomy is completely different. They evolved flight separately.

All of them. Some animals may have remained the same for a long time, however, they did diverge from a common ancestor at some point in time.

Species like Ardi have been found in Africa.

The last common ancestor of all animals was likely an organism not unlike modern-day protists.

A single celled animal, not a plant found in the deepest oceans.

It is important to understand the challenges in a species environment because it would help us to understand what the species should be call and why there here and what ever happens to the species of what it do or do not do, will help us understand species evolution.

Example: what we humans study animals we check what they go through just to know what they do, we do this because to see if evolution occur, evolution is important to see on other species to if the animal can act like a human or a human act like an animal, is like what we say now in days a monkey is going through evolution because they act like us humans and looks. This worry us cause many think the monkeys or gorrilas may take over the world or extinct us human is what there theory is. I hope you understood cause I been new this question since I was 7, your welcome by Titanium Chrome.

According to the Theory of Evolution, all organisms have a shared ancestry.

Also, amphibian is a term that can be used to indicate a particular property (ie. coldblooded organism living both on land and in water) that may belong to groups of organisms stemming independently from divergent clades. Used in this sense amphibians are a paraphyletic group. The term amphibian can also be used to indicate a member of the clade Amphibia, a monophyletic grouping within cladistics.

The most recent ancestor common to Amphibia and Reptilia (which would include Mammalia, under the monophyletic usage) would have belonged to the clade of Tetrapoda. This means that both Amphibia and Reptilia (including Mammalia) are Tetrapoda.

Predation causes traits that enable prey to evade predators to be favoured in the population gene pool.

In vertebrates, definitely. The first animals which were invertebrates evolved in the Precambrian time around 600 million years ago. The first vertebrates appeared around 520 million years ago in the Cambrian. Dinosaurs did not emerge until about 230 million years ago in the Triassic.

Humans Had Evolved From Nomads to Civilization By Moving from place to place during the seasons. They Also Searched for food and water. One member in the group had to hunt, fish. A couple of groups had cut trees or grass, then burned them to clear a field. Some Humans Had even started to tame animals. The humans mind started to improve and develop by the education or training. So the Civilization had also advanced state of the humans society in which the high level of culture, science, and government had been reached.

The first fossil remains that have been found were dated around 4.4 million years ago. These were the fossils of Ardipithecus Ramidus, which lived 1 million years before the last fossils that were found.

The same as it was when and after vertebrates. Evolution is the change in allele frequency over time in a population of organisms. Change over time. Happens and happened in single celled organisms and invertebrates long before there were vertebrates.