What are the 9 most significant intermediate forms of animal life and the sequencing until arriving at man?

Question

1. Using the theory of evolution, explain the start of animal life and the logical sequencing until finally arriving at man. In your answer, in clued the names of the nine most significant intermediate forms, the dates of these forms and a description of why they adapted as they did.

Answer 1

http://tolweb.org
Go to Tree of Life web site for lineages, refs, etc.
Your question would take many pages to answer in full. However, here are some of the steps in the family tree of humans as deduced from the fossil record and from genetic comparisons :
1. very very simple forms of life
2. first cells with nuclei , the eukaryotes, about 3.5billion years ago. choanoflagellate eukaryotes appear about 1 billion years ago. This lineage produces...
3. the first simple multicellular animals (Metazoa) About 565 million years ago.
4. Soon, the first bilaterally symmetric forms among the metazoans. Bilateria Triploblasts, Bilaterally symmetrical animals with three germ layers appear about 565million years ago.
5. Then the Bilateria (deuterostoma) evolve some forms that are longitudinally differentiated into head, trunk and tail--the Chordata. 525million years ago.
6. A very long time later, about 420 to 400 million years ago(Late Silurian or Early Devonian), the first simple vertebrates (Vertebrata: animals with backbones )evolve from a lineage of chordates called Craniata.
7. Later, the Vertebrates diversify and a lineage of vertebrates with jaws appears in the fossil record (Gnathostomata); then this group diversifies and a lineage of jawed vertebrates now called Sarcopterygii can be traced. The earliest forms were lobed-finned fishes, but later forms were the first terrestrial animals.
8.Terrestrial vertebrates: Stegocephalians The oldest known skeletal remains of terrestrial vertebrates are Devonian in age.
9. then, terrestrial vertebrates diversified and one branch of 4 legged terrestrial vertebrates evolved. Tetrapoda
10. The tetrapods diversified and gave rise to the lineage called Amniota-characterized by large "amniotic" eggs. Pennsylvanian time.
11.Within this group, the lineage Synapsida appeared in the Middle Pennsylvanian (320 million years ago). Early synapsids had a sprawling posture and a small brain, like most early tetrapods. By early Permian, this group had diversified and one lineage was the Therapsida.
12. A very long time later, in the Jurassic, diversification among the therapsids produced the very first animals with characteristics of mammals. Mammalia.
13. Thereafter, the placental mammals (Eutheria) evolved.
14. The Primates were one of many lines of Eutheria. The primates diversified, and one lineage Catarrhini gave rise to the Hominidae lineage (which includes Humans, great apes, and their extinct relatives ) about 4.4-5.2million years ago. Gibbons, Old World monkeys came from other lines of the Catarrhini.
15. Within the Hominidae group, the genus Homo appeared about 2.6 million years ago.