the best known mass extinction event occurred about 65 million years ago when the disappeared from the fossil record.

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Answer 1

The best known mass extinction event occurred about 65 million years ago when the dinosaurs disappeared from the fossil record.

One of the most well-known mass extinction events in Earth's history occurred approximately 65 million years ago, during the Cretaceous Period. This event is often referred to as the Cretaceous-Paleogene (K-Pg) extinction event. It marked the disappearance of various groups of organisms, including the dinosaurs, from the fossil record.The K-Pg extinction event is believed to have been triggered by a combination of factors, with the most significant being a large asteroid impact. It is widely accepted that a massive asteroid, estimated to be about 6 miles (10 kilometers) in diameter, struck the Earth near the present-day Yucatán Peninsula in Mexico. The impact released an enormous amount of energy, causing widespread devastation.The immediate effects of the impact included enormous fires, seismic activity, and a massive tsunami. The impact also resulted in a significant release of dust, soot, and sulfur compounds into the atmosphere, blocking sunlight and causing a rapid decline in temperature. This phenomenon, known as an impact winter, severely disrupted the Earth's ecosystems, leading to the extinction of numerous species, including the dinosaurs.

In conclusion, the disappearance of dinosaurs from the fossil record around 65 million years ago was a consequence of the catastrophic K-Pg extinction event, primarily triggered by a large asteroid impact.
impact.

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Related Questions

systemic distribution of cancer cells to other sites of the body through the bloodstream or lymph is a process known as __

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The process of systemic distribution of cancer cells to other sites of the body through the bloodstream or lymph is known as metastasis.

What is Metastasis?

Metastasis is the term used to refer to the spread of cancer cells from the original cancerous site (primary site) to other sites in the body via the bloodstream or lymphatic system. Metastasis is an important feature of malignant tumors, which distinguishes them from benign tumors, which do not spread beyond the original site of the cancerous cells. When cancer cells migrate to a new area of the body and begin to grow there, the resulting tumor is referred to as a secondary or metastatic tumor.

Metastasis is one of the most dangerous aspects of cancer. It can lead to the formation of new tumors in other areas of the body, making it much more difficult to treat. Additionally, metastasis can cause damage to important organs or other tissues, which can lead to a variety of complications and even death.

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true or false? the cross-price elasticity of demand between butter and margarine is positive.

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True. The cross-price elasticity of demand between butter and margarine is positive, indicating a substitute relationship between the two products.

When the price of butter increases, consumers tend to switch to margarine as a lower-priced alternative, leading to an increase in the demand for margarin.To understand why the cross-price elasticity of demand is positive, we need to consider the concept of substitutes. Butter and margarine are often considered substitutes for each other because they serve a similar purpose as spreads and have similar taste profiles.When the price of butter rises, consumers may find it less affordable and seek a cheaper alternative. Margarine, being a lower-priced option, becomes relatively more attractive. As a result, consumers increase their demand for margarine, causing the positive cross-price elasticity.Conversely, if the price of butter decreases, consumers may be less inclined to switch to margarine since butter becomes more affordable. In this case, the cross-price elasticity would be negative or zero, indicating a weak or no substitution effect.

Overall, the positive cross-price elasticity between butter and margarine suggests that they are indeed substitute goods.

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Fill In The Blank, harrison wants to show a human brain for his speech, but using an actual brain is impractical, difficult to obtain, and a biohazard. the most similar alternative is _______.

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Harrison wants to show a human brain for his speech, but using an actual brain is impractical, difficult to obtain, and a biohazard. The most similar alternative is a 3D model. Using the brain's image as a base, 3D modeling software can be used to create a 3D model.

The most realistic way to create a 3D model of the human brain is to use an MRI machine to scan the brain and create an image. Using that image as a base, 3D modeling software can be used to create a 3D model. There are many software packages available for 3D modeling, including some that specialize in brain imaging. Once the model is created, it can be printed on a 3D printer, allowing for a physical model that can be used in presentations and speeches.

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in a mixed lymphocyte reaction the donor cells are irradiated to ensure that they do not _____.

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In a mixed lymphocyte reaction (MLR), the donor cells are irradiated to ensure that they do not proliferate or divide, and to prevent rejection. The correct option is C. Proliferate.

In a mixed lymphocyte reaction, T cells from two different people are cultured together. A mixed lymphocyte reaction (MLR) is a laboratory technique for determining the compatibility of T cell surface antigens from different people.

The cells of two people are mixed in a mixed lymphocyte reaction to see how they will react.

The amount of proliferating T cells is proportional to the degree of histoincompatibility between the two populations when there is a rejection response. Irradiation is a method of preventing T cell division and proliferation.

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active immunity involves a person becoming immune to a pathogen as a result of having a disease. a) true b) false

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The given statement "active immunity involves a person becoming immune to a pathogen as a result of having a disease" is true.

Active immunity is the acquired immunity that the body has produced against a pathogen after an antigen's exposure. Immune cells and antibodies are formed during active immunity in response to the presence of a pathogen (such as a virus or bacteria).This happens in two ways: A person can develop active immunity by getting a disease or by getting a vaccine that contains a weakened or dead version of the pathogen.

As a result, active immunity is a natural process, while passive immunity is obtained through external means (e.g., vaccines, antibodies).In a way, when a person is infected with a disease, the immune system is alerted and produces an immune response. The immune system identifies the pathogen and makes a note of it to remember how to fight it if it enters the body again. Hence, the person becomes immune to the pathogen.

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