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Marrrta [24]
3 years ago
8

Why must organisms reproduce?

Geography
2 answers:
Anton [14]3 years ago
7 0
To keep the species from dying off.
LekaFEV [45]3 years ago
7 0
Reproduction is necessary for living things because it enables them to create offspring and continue their population. Through reproduction, they pass on their genetic information to the next generation. This ensures that their species continues to exist on Earth that is why the organism reproduces .
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Describe the circumstances leading to desertification
Alja [10]

Answer:

Explanation:

Desertification:

The process of the land degradation in arid , semi - arid , and sub - humid areas because of the factors , human activities , climatic variations .

This process lead to persistent degradation of the dry land and ecosystem because of some variation in climate and man - made activities .

The major cause of Desertification are -

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2. Overgrazing

3. Deforestation

4. Unsustainable agriculture techniques

5. Climate change

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3 years ago
Construct a concept sketch illustrating the main events in the history of life as observed from the fossil record. This sketch w
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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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3 years ago
How did ptolemy account for retrograde motion in his model of the solar system
IgorC [24]

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Ptolemy accounted for 'retrograde motion' in his model of the solar system by introducing smaller circles named 'epicycles'.

<u>Explanation:</u>

  • According to Ptolemy, the Sun and the other planets in the Solar system orbited around the Earth.
  • The Greeks were convinced that Ptolemy's earlier model did not provide for backward or the retrograde motion.
  • Ptolemy thought over it for a while and theorized the possibility of 'epicycles'.
  • According to Ptolemy, the planets that orbited Earth also orbited another smaller point.
  • The smaller orbits followed by the planets while in motion around the Earth in a larger orbit were introduced by Ptolemy as 'epicycles'.
  • Until Kepler proposed his models of the functioning of the Solar system, Ptolemy's models were considered the most relevant.
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