SWZ2〇25年十二月九年级学业评测历史试题
SWZ2〇25年十二月九年级学业评测历史试题于2025-12-21发布，目前已经汇总了SWZ2〇25年十二月九年级学业评测历史试题的各科答案和试卷，更多试卷答案请关注本网站。
本文从以下几个角度介绍。
- 1、2024年初中学业考查模拟试卷九年级历史学科no_ai_sugtypesugsas_2q2024～2024学年度九年级历史no_ai_sugtypesugsas_3q初中学业考试指导丛书历史九年级答案no_ai_sugtypesugsas_4q2024年九年级历史学科综合测试题no_ai_sugtypesugsas_5q2018～2019学年第一学期九年级阶段性测评历史试卷答案no_ai_sugtypesugsas_6q2017～2018学年第一学期九年级阶段性测评历史no_ai_sugtypesugsas_7q2024-2024学年第一学期素质考试题九年级历史no_ai_sugtypesugsas_8q2024—2024学年度第一学期九年级历史no_ai_sugtypesugsas_9q2024-2024学年度第一学期期末质量检测九年级历史no_ai_sugtypesugsas_10q2024-2024学年度第一学期期末考试九年级历史no_ai_sug
SWZ2〇25年十二月九年级学业评测地理试题
27. How does the author feel about the future life
A. Peaceful. B. Promising. C. Upset. D. Regretful.
C
Ecosystems are complex networks of interactions among species, and understanding how they function is crucial for preserving biodiversity. Scientists have long been attracted by the role of keystone species organisms that have a significantly large impact on their environment relative to their abundance. Through mathematical models and field studies, researchers have uncovered how these species shape ecosystems and maintain their stability.
Keystone species often regulate the populations of other species, either directly or indirectly. For example, sea otter (海獭) in seaweed forests prey (捕猎) on sea urchins (海胆), which, if left unchecked, can overfeed on seaweed and destroy the habitat. By controlling sea urchin populations, otters ensure the survival of seaweed forests, which in turn support the diversity of marine life. Similarly, wolves in Yellowstone National Park influence not only their prey, such as deer, but also the vegetation and even the behavior of rivers by reducing overfeeding. These examples highlight the fundamental effects keystone species can have on entire ecosystems.
Mathematical models have revealed that the removal of keystone species can lead to significant disruptions. In their absence, ecosystems may experience a loss of biodiversity, shifts in species dominance, and even collapse. This phenomenon, known as “trophic cascade”, underscores the importance of keystone species in maintaining ecological balance. Human activities, such as hunting, habitat destruction, and pollution, have often led to the decline or extinction of these critical species, with far-reaching consequences.
To address these challenges, scientists have developed monitoring systems to track the health of ecosystems and identify potential threats to keystone species. These systems aim to provide early warnings of ecological imbalances, allowing for timely interventions. Conservation efforts focused on protecting keystone species have proven effective in restoring ecosystems, as seen in the reintroduction of wolves to Yellowstone.
SWZ2〇25年十二月九年级学业评测生物试题
6、SWZ2〇25年十二月九年级学业评测数学试题
A.①②③④
3、SWZ2〇25年十二月九年级学业评测语文试题
3、SWZ2〇25年十二月九年级学业评测生物试题
6、SWZ2〇25年十二月九年级学业评测政治试题
3.【答案】C
4.【答案】A
5.【答案】B
6.【答案】D
7.【答案】BCD
8.【答案】ACD
9.【答案】AC
SWZ2〇25年十二月九年级学业评测化学答案
SWZ2〇25年十二月九年级学业评测生物学试题
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