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Vlada [557]
3 years ago
9

Fossils of tropical plants and animals can be found buried in limestone rock in the North Texas area. These plants and animals a

re no longer found in this region. What is the most likely cause of the disappearance of these tropical plants and animals?
Question 3 options:


Air pollution and acid rain killed off all the tropical plants and animals.


Earthquakes and volcanoes destroyed all the tropical plants and animals.


The climate in that area is different today than when tropical plants and animals lived there.


Tropical animals ate all the tropical plants and everything died out.
Biology
1 answer:
IrinaVladis [17]3 years ago
7 0

Answer:

The climate in that area is different today then when tropical plants and animals lived there

Explanation:

The climate on Earth is constantly changing, and there's numerous factors that contribute to it. The climate can shift from being warm and wet, to cold and dry relatively quickly, thus changing the flora, fauna, and the landscape as a whole. It is no wonder that tropical plants and animals are found in the fossil records in the northern part of Texas, as in the past this region has been dominated by warm and wet climate. That enabled the development of a biome that supported tropical plants and animals. That didn't lasted forever of course, and the climate changed, so Texas became a place with more temperate climate with relatively small amount of precipitation, resulting in changes of what types of animals and plants live there.

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The trp and lac operons are regulated in various ways. how do bacteria regulate transcription of these operons?
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Operon is not transcribed:

-lac operon: lactose absent

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Positive control transcription of Operon does not speed it up:

Lactose and glucose are present, -lac operon

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Operon is transcribed quickly through positive control:

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Only negative control is used to regulate the trp operon. The operon genes are not transcribed when tryptophan is present.

Both positive control and negative control are used to control the lac operon.

Negative control: —Transcription is inhibited when lactose is missing due to the activity of the repressor protein.

—The repressor protein is deactivated and transcription is triggered when lactose is present.

Positive control: —In the absence of glucose, another regulatory protein (CAP) attaches to the lac operon's promoter, speeding up transcription in the presence of lactose.

Learn more about lac operons here:

brainly.com/question/1695549

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Answer:

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