Paleozoic Era the part of geologic time million years ago ; invertebrates, fishes, amphibians, reptiles, ferns, and cone-bearing trees were dominant Mesozoic Era middle life million years ago ; rise of mammals and dinosaurs; the rise of birds; extinction of dinosaurs, rise of flowering plants Cenezoic Era Era of recent that began about 66 MYA, and continues today.
Variations among species are caused by adaptations because an organism of a species may differ from another in their traits. This means that in order to survive, different organism will develop certain things in order to reduce competition and increase their chances of survival.
Explain the theory of natural selection. The theory of Natural Selection is a theory that explains how some organisms of the same species, may be better adapt to survive than others. What are adaptations and how are they found in an organism?
What can adaptations tell us about past organisms? Adaptations can tell us certain things about organisms, such as what it ate, where it lived, how it moved, how it reproduced, and how it survived overall.
What are fossils and when can they range from to be classified as so? Fossils are the preserved remains or traces of a specific organism that lived in the past, or a time before ours.
Fossils are mainly from less than 10, years ago and are often times found in sedimentary rock. What are the six different types of fossils and what are each ones differences?
The six different types of fossils are mold, which forms when sediments bury an organism in multiple layers, as the organism decays, a cavity is left in the shape of it in the sediment; cast, which forms when a mold of a fossil is filled with sand or mud; carbonized, which forms when an organism is pressed in between layers, leaving an imprint in the rock; petrified, which forms when minerals soak in the remains and changing them into rock; preserved, which forms when an organism is prevented from decaying with tar, ice, rock, or amber; trace, which is formed when mud or sand hardens into stone where something left by the organism was.
What is the fossil record? The fossil record gives us farther information about the past life and environments that were on earth. What can the fossil record give us clues about?
The fossil record can give us clues about the diversity of living and once living things, the past climate s on earth, and the changes that have occurred with organisms over time. What is absolute dating used for?
Absolute dating can be used for identifying the time frame in which an organism lived and died in. What is the most common type of absolute dating and what does it do? The most common type of absolute dating radioactive dating. Radioactive dating is when radio isotopes within a substance are compared to those in the modern day.
What is relative dating? Relative dating is the age of an object compared to the age of another object, although, this method cannot be used to tell the exact age of said object. How are rock layers ordered and what is the law used to do so?
The law used to order rock layers as well as what identifies them to do so is the Law of Superposition. This is when each rock later gets older as more and more pile upon it. Therefore, the closer to the surface the rock layer it, the younger it is.Download-Theses Mercredi 10 juin Earth’s History Mr.
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Choose a Membership Plan. col-md-5 col-lg-5">Mesozoic. Which plants were among those that were common during the Mesozoic era? Cycads, conifers, and the ginkgoes. Most scientists. The Mesozoic Era (/ the largest well-documented mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event, another mass extinction whose victims included the non-avian dinosaurs.
The Mesozoic was a time of significant tectonic. Psychology and Geology - Psychology is the study of the mind and the behavior of mammals. Geology is a science that deals with the history of the earth and its life, recorded in rocks.
The history of Earth is divided into four great eons, starting 4, mya with the formation of the planet. Each eon saw the most significant changes in Earth's composition, climate and life. Each eon saw the most significant changes in Earth's composition, climate and life.
The Mesozoic era continued setting the stage for warmer climates to follow. After the Triassic period came the second period in the Mesozoic era, which was the Jurassic period.
This period began around million years ago, and is known for the increase in number, and diversity of dinosaurs.