Address the key evolutionary adaptations that arose as life colonized on land. What conditions on early Earth made it possible for life to develop? How have those adaptations and conditions influenced life on Earth as it is today?© BrainMass Inc. brainmass.com October 1, 2020, 8:48 pm ad1c9bdddf
address the key evolutionary adaptations that arose as life colonized on land. What conditions on early Earth made it possible for life to develop? How have those adaptations and conditions influenced life on Earth as it is today?
Evolution is one of the unifying concepts of biology, that embodies the belief that existing animals and plants developed by a process of gradual, continuous change from previously existing forms. This theory, also known as descent with modification, constitutes organic evolution.
Inorganic evolution, on the other hand, is concerned with the development of the physical universe from unorganized matter. Organic evolution conceives life as having had its beginnings in a simple primordial protoplasmic mass (probably originating in the sea) from which, through the long eras of time, arose all subsequent living forms. The earth came into being about 4.6 billion years ago. Heat from gravitation and radioactivity formed the earth in several layers with iron and nickel in a liquid core, silicate minerals in a semi liquid mantle, and upwelling of volcanic lava formed a crust. The stages of chemical evolution include
i.The formation of the earth's atmosphere
ii.Evolution of monomers
iii.Evolution of progenote (protocells)
The Formation of the Atmosphere
1. The earth's size provides a gravitational field strong ...
Life originated in aquatic medium. Archebacterians were the first to evolve and they carry out their life in reducing medium. With the evolution of cyanobacteria the environment slowly starts changing from reducing to oxidizing. Terrestrial evolution occurs with the appearance of bryophytes