The UN Environment Programme reports that, over the past century, more than 800 species have disappeared and at least 10,000 species are now considered to be
.

Question

The UN Environment Programme reports that, over the past century, more than 800 species have disappeared and at least 10,000 species are now considered to be 
.

BlackTom AI · Accepted Answer

Endangered species are those facing a very high risk of extinction in the near future, so "endangered" fits the blank.

1) Relevant knowledge points and concepts:
- Extinction means a species has disappeared completely (no living individuals).
- Conservation status categories (IUCN/UN reporting) include "vulnerable," "endangered," and "critically endangered"; together these may be called "threatened," but each has a specific meaning.
- The UN Environment Programme and related biodiversity reports commonly report numbers of species that are extinct (disappeared) and those that are endangered.

2) Step-by-step reasoning:
- The sentence contrasts two quantities: "more than 800 species have disappeared" and "at least 10,000 species are now considered to be ___." The first phrase uses "disappeared" to indicate extinction already occurred.
- The second phrase must name a conservation status for species at risk but not yet extinct.
- Of standard single-word conservation categories, "endangered" precisely denotes species at high risk of extinction, matching the intended contrast.

3) Intermediate steps / numerical context:
- Given: >800 species extinct (past tense: disappeared).
- Given: ≥10,000 species in a risk category (present tense: now considered to be ___).
- Logical mapping: extinct (disappeared) vs. high-risk category (endangered). No further arithmetic is required; the numbers emphasize scale (hundreds extinct, thousands endangered).

4) Why the correct answer is correct:
- "Endangered" is the conventional single-word term used in UN and IUCN communications to indicate species facing a very high risk of extinction, so it fills the blank accurately and grammatically.

5) Why other possible words would be incorrect:
- "Extinct" would duplicate "disappeared" and is incorrect because the 10,000 are not already gone.
- "Threatened" is an umbrella term (includes "endangered") but is less specific; the authoritative phrasing and common usage in UNEP summaries use "endangered."
- "Vulnerable" or "critically" would not fit the most commonly reported single-word statistic.

6) Conclusion:
Therefore, the appropriate word to complete the sentence is "endangered," which matches the provided answer.

The UN Environment Programme reports that, over the past century, more than 800 species have disappeared and at least 10,000 species are now considered to be .未知题型

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