biology

Timeline of extinctions in the 20th century

Timeline of extinctions in the 20th century is a biology topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Timeline of extinctions in the 20th century rather than just read about it. In short: This timeline of extinctions is a chronological list of biological species, subspecies, and other evolutionary significant units recorded to have disappeared during the course of the 20th century. Following the parent timeline of extinctions in the Holocene, the entries included range from 1900 to 1999, even though the 20th century is properly established to have lasted from 1 January 1901 to 31 December 2000.

Key takeaways

Timeline of extinctions in the 20th century belongs to biology; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Timeline of extinctions in the 20th century to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Timeline of extinctions in the 20th century from memory before moving on to harder problems.

Reference excerpt

This timeline of extinctions is a chronological list of biological species, subspecies, and other evolutionary significant units recorded to have disappeared during the course of the 20th century. Following the parent timeline of extinctions in the Holocene, the entries included range from 1900 to 1999, even though the 20th century is properly established to have lasted from 1 January 1901 to 31 December 2000. For extinctions in 2000, see timeline of extinctions in the Holocene#21st century. The list is incomplete by necessity, since the majority of extinctions are thought to be undocumented, and for many others there isn't a definitive, widely accepted last, or most recent record. According to the species-area theory, the present rate of extinction may be up to 140,000 species per year.

Timeline

1900s

1910s

1920s

1930s

1940s

1950s

1960s

1970s

1980s

1990s

See also Timeline of extinctions in the Holocene Timeline of extinctions in the 19th century Timeline of the 20th century 20th century in science

Notes

References

Illustrations

Worked examples

Example 1 — a first encounter with Timeline of extinctions in the 20th century

Start with the simplest possible case. Write down what Timeline of extinctions in the 20th century claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Timeline of extinctions in the 20th century before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Timeline of extinctions in the 20th century ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Timeline of extinctions in the 20th century

In research: Timeline of extinctions in the 20th century appears in biology research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Timeline of extinctions in the 20th century in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Timeline of extinctions in the 20th century is common in secondary-school and first-year university syllabi. It links to neighbouring topics 20th century in biology, Biology timelines, Extinction, so understanding it makes those chapters shorter.
In everyday life: Look for Timeline of extinctions in the 20th century outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Timeline of extinctions in the 20th century in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Timeline of extinctions in the 20th century means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Timeline of extinctions in the 20th century out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Timeline of extinctions in the 20th century in simple terms?

Why does Timeline of extinctions in the 20th century matter?

Because it connects several biology ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Timeline of extinctions in the 20th century?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Timeline of extinctions in the 20th century.