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3 years ago

Science under modern classification systems, in what clade will you find birds?

2 answers:

8 0

Birds evolved from reptiles in Mesozoic era and their ancestors are small dinosaurs called theropods while they belong to class aves.

Further Explanation

Birds as dinosaurs

They are evolved in Mesozoic era either from thecodonts or theropods. These are two possibilities.

Thecodonts hypothesis

These are earlier reptiles which gave rise to dinosaurs (arboreal dinosaurs called pterosaurs and crocodiles) in Mesozoic era. Their body was covered with scales.

Theropods

They were bipedal carnivorous dinosaurs having sharp teeth to tear their prey. Earlier they were non-flying and gave rise to small flying dinosaurs. Their fossil study reveals that they were similar to birds.

Birds as reptiles

Taxonomic study reveals that birds are descendants of reptiles and fossil of Archaeopteryx lithographica is the evidence.

<em>Archaeopteryx lithographica </em>

Archaeopteryx was first fossils of birds that was found in Bavarian quarry by a German naturalist. It was crow sized, bipedal, with small snout having sharp teeth, strong muscles and large furcula.

Archaeopteryx Vs modern birds

Modern birds possess larger brain with enlarged visual center as compared to archaeopteryx. Modern birds had evolved advance neural system for flight.

Aves

It is class of vertebrate birds having characteristics like bill, wishbone, pygostyle and furcula.

Answer details

Subject: Biology

Level: High school

Key words

 Birds as dinosaurs

 Thecodonts hypothesis

 Theropods

 Birds as reptiles

 Archaeopteryx lithographica

 Archaeopteryx Vs modern birds

 Aves

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MrMuchimi3 years ago

4 0

According to modern systems of classification, birds are descendants of T<span>heropoda dinosaurs. These dinosaurs are called Paraves. From this clade, a node is made during the evolution. The new clade is called Aves. This is where birds are classified.</span>

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Prokaryotic organisms are separated into two domains or groups: Bacteria and Archaea.

<h3>What are prokaryotic organisms?</h3>

Prokaryotic organisms are those whose cells do not have a membrane that delimits the cell nucleus and, instead, present their genetic material dispersed in an area called the nucleoid.

<h3>Characteristics of prokaryotic organisms</h3>

Prokaryotic cells form unicellular living organisms, belonging to the Archaea and Bacteria domains, depending on the preferred biological classification.

The Bacteria domain groups the most primitive prokaryotic organisms of all, they are dedicated to various types of metabolic activity: photosynthesis, such as cyanobacteria (blue-green algae), the decomposition of organic matter, etc.

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2 years ago

A crater in mexico's yucatan peninsula may be the result of an impact that brought about the extinction of numerous species at t

Ann [662]

Answer:

Cretaceous

Explanation:

From what has been examined so far, there are evidence that at the end of the Cretaceous period a very large asteroid or comet stuck the Earth. The impact was where modern day Yucatan is located, and it released such an enormous energy that it managed to change the face of the Earth. The explosion itself managed to kill off pretty much everything nearby, but there was also a very hot wave that circled the whole planet. Enormous amounts of dust and ashes were released into the atmosphere that blocked the Sun, and the volcanoes all over the globe were triggered. This caused major climate and environmental changes, leading to a mass extinction, with the most noticeable victims being the dinosaurs.

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3 years ago

the illustration shows a scale model of a pond in a local park the scale is 1:21 the model shows the pond is 3 cm deep. How deep

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Answer:

Option D, 63 cm

Explanation:

The scale of model is of local park is $1:21$