How many MYA was the mass extinction of dinosaurs, ammonoids, and many land plants?

1 answer:

6 0

The Cretaceous–Paleogene (K–Pg) extinction event (also known as the Cretaceous–Tertiary (K–T) extinction) was a sudden mass extinction of three-quarters of the plant and animal species on Earth, approximately 66 million years ago.

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In 1980, lava that flowed from the eruption of Mount Saint Helens in the state of Washington destroyed the vegetation that once

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Explanation:Mount St. Helens, Washington, is the most active volcano in the Cascade Range. Its most recent series of eruptions began in 1980 when a large landslide and powerful explosive eruption created a large crater, and ended 6 years later after more than a dozen extrusions of lava built a dome in the crater.

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Use the drop down menu to complete each statement about contour lines

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Hey bud, this is not a question someone can answer. Try giving us the drop down menu stuff?

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A chronic bone disease that is characterized by the abnormal breakdown of bone followed by abnormal bone formation is known as

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Paget's disease

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When cellular deforming and remodelling of many bones takes place and this occurs as a chronic condition then this is known as Paget's disease.
There is excessive breakdown of bone as well as disorganised formation of new bones.
Such problem leads to weakening of the bone due to which complications such as deformity, fracture and arthritis occurs.
The disease does not spread from one bone to another and the entire skeleton is not affected in such a disease, it only affect few or more bones.
There is currently no known cure for the disease.

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The diagram shows the process of transcription, which takes place in the nucleus of a cell. What is occurring?

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<span>Transcription is the process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA). DNA safely and stably stores genetic material in the nuclei of cells as a reference, or template. Meanwhile, mRNA is comparable to a copy from a reference book because it carries the same information as DNA but is not used for long-term storage and can freely exit the nucleus. Although the mRNA contains the same information, it is not an identical copy of the DNA segment, because its sequence is complementary to the DNA template.</span>

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