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ehidna [41]
3 years ago
13

Construct a concept sketch illustrating the main events in the history of life as observed from the fossil record. This sketch w

ill show when the main types of organisms, such as trilobites and dinosaurs, appeared in the fossil record and when they became extinct or whether they are still around today. The change of fossils from older to younger rock layers is commonly called faunal succession, and it is the main way that geologists determine the age of fossil-bearing rock layers.

Geography
1 answer:
zvonat [6]3 years ago
8 0

Answer:

Fossils are important features that are present in the sedimentary rocks. This provides evidence of how life has evolved over a large geological time scale.

Initially, the first life forms were unicellular, microorganisms, whose remnants are found to be present in the chert rocks of Australia, that are about 3.46 billion years old belonging to the Archean era.

Next to this, there occurred a new species, known as the trilobites which were first appeared in the Cambrian (540 million years back) and got extinct by the end of Permian (250 million years). These are found to be present in the Paleozoic rocks of Utah, the United States, and Oklahoma.

The next well-developed species existed were the dinosaurs, which first appeared in the Triassic, dominant in the Jurassic and got extinct by the end of Cretaceous. This involved the time from about 250 million years back to 65 million years back.

Thus, this is how life has evolved from simpler to complex organisms, including the present-day humans. This study of changes that occurs in the fossils found in the rocks from the bottom (older) to the top (younger) is considered as faunal succession, and the geologist evaluates the age of the rocks that comprises the distinct fossils.

An image has been attached below, showing the occurrence of different life forms namely microorganisms, trilobites, and dinosaurs in the geological history at different places on earth.

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Give at least three examples each of primary and secondary sources. Explain the difference between them. (OC1)
nikdorinn [45]

Answer:

A primary source is anything that gives you direct evidence about the people, events, or phenomena that you are researching. Primary sources will usually be the main objects of your analysis. If you are researching the past, you cannot directly access it yourself, so you need primary sources that were produced at the time by participants or witnesses (e.g. letters, photographs, newspapers).

A secondary source is anything that describes, interprets, evaluates, or analyzes information from primary sources. Common examples include: 1. Books, articles and documentaries that synthesize information on a topic 2. Synopses and descriptions of artistic works 3. Encyclopedias and textbooks that summarize information and ideas 4. Reviews and essays that evaluate or interpret something When you cite a secondary source, it’s usually not to analyze it directly.

Examples of sources that can be primary or secondary:

A secondary source can become a primary source depending on your research question. If the person, context, or technique that produced the source is the main focus of your research, it becomes a primary source.

To determine if something can be used as a primary or secondary source in your research, there are some simple questions you can ask yourself: 1. Does this source come from someone directly involved in the events I’m studying (primary) or from another researcher (secondary)? 2. Am I interested in analyzing the source itself (primary) or only using it for background information (secondary)?

Most research uses both primary and secondary sources. They complement each other to help you build a convincing argument. Primary sources are more credible as evidence, but secondary sources show how your work relates to existing research.

7 0
3 years ago
Which natural attraction in USA are in greatest need of conservation?
Kay [80]
Forests(because of trees, water, and other plants and animals living there.)
4 0
3 years ago
The approximate population of India is ___.
MatroZZZ [7]

Answer:

The approximate population of india is about 1.3 billion people (2018)

Explanation:

7 0
3 years ago
B) ¿Qué ocurrió durante la llamada “Crisis de los Misiles”?
Sholpan [36]

Answer:

The consequences of the crisis were many and varied. Relations between Cuba and the Soviet Union were on shaky ground for some time after Khrushchev's removal of the missiles, as Fidel Castro accused the Russians of backing down from the Americans and deserting the Cuban revolution.

Explanation:

3 0
3 years ago
Question 5 ListenA ball is thrown straight upward from the surface of Earth. Which statement best describes the ball’s velocit
mars1129 [50]

Acceleration is non zero but the velocity is zero.

Answer: Option 2.

<u>Explanation:</u>

Acceleration is the speed that an object gains with in a short period of time. In the language of Mechanics, Acceleration is the change in the velocities of the objects with respect to the time. So when a ball is thrown up in the air, there will be some acceleration and there will be some speed that the ball will gain when thrown up.

Velocity is the speed of an object but in a particular direction. Velocity of an object is the rate of change of the position of the object with respect to the frame of reference of that frame. So the velocity of the ball up in the air is zero.

3 0
3 years ago
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