7. explain what a feedback loop is using the terms input, output, and homeostasis.

8. top predators are often keystone species in their habitat. explain what happens to the biodiversity of an ecosystem when a top predator is deliberately removed from the ecosystem in which it lives.

9. do you think it is possible for a biome to change due to human activities? explain a situation in which this might happen.

10. biodiversity hot spots are found around the world. why can’t scientists come up with a single solution to protect all of these areas?

Question

7. explain what a feedback loop is using the terms input, output, and homeostasis.

8. top predators are often keystone species in their habitat. explain what happens to the biodiversity of an ecosystem when a top predator is deliberately removed from the ecosystem in which it lives.

9. do you think it is possible for a biome to change due to human activities? explain a situation in which this might happen.

10. biodiversity hot spots are found around the world. why can’t scientists come up with a single solution to protect all of these areas?

Accepted Answer

### Question 7
# Brief Explanations:
A feedback loop helps maintain homeostasis (stable internal conditions). Input is a signal/stimulus (e.g., temperature change). The system processes it, and output is a response (e.g., sweating/shivering). Positive feedback amplifies output (e.g., childbirth contractions), negative feedback reduces output to restore balance (e.g., temperature regulation: if too hot, input triggers cooling output like sweating; when temp normalizes, feedback stops the output).
# Answer:
A feedback loop is a process where an input (stimulus, e.g., temperature rise) is detected, the system generates an output (response, e.g., sweating) to maintain homeostasis (stable internal environment). In negative feedback, output counteracts input (restoring balance, e.g., cooling after overheating); positive feedback amplifies input (e.g., childbirth contractions increasing until birth).

### Question 8
# Brief Explanations:
Top predators (keystone species) control prey populations. Removing them causes prey overpopulation (e.g., wolves removed, deer overgraze). Overgrazing reduces plant diversity, which affects herbivores, then carnivores. Trophic cascades occur: ecosystem structure (species numbers, interactions) collapses, so biodiversity (variety of life) decreases.
# Answer:
When a top predator (keystone species) is removed, its prey population explodes (no predation control). Prey overconsume resources (e.g., plants), reducing plant biodiversity. This triggers a trophic cascade: herbivore diversity drops (from food scarcity), then secondary consumers, etc. Overall, ecosystem structure destabilizes, and biodiversity (species richness, abundance, and interactions) declines.

### Question 9
# Brief Explanations:
Yes, human activities can change biomes. For example, deforestation in tropical rainforests (a biome) for agriculture (e.g., palm oil plantations) replaces diverse rainforest with monocultures. This alters climate (less transpiration, drier), soil (nutrient loss), and species composition, potentially converting rainforest to savanna - like biome over time.
# Answer:
Yes, human activities can change biomes. For instance, deforestation of tropical rainforests (for logging, agriculture) removes trees, reducing transpiration (moisture release) and soil nutrients. Over time, the rainforest biome may transition to a savanna - like biome (with grasslands, fewer trees) as species adapted to rainforest conditions die, and grassland - adapted species dominate.

### Question 10
# Brief Explanations:
Biodiversity hotspots differ in ecosystems (e.g., rainforests, coral reefs), threats (deforestation, overfishing, urbanization), and socio - economic contexts (local cultures, economies). A single solution (e.g., strict protected areas) may not work: some hotspots have human - dependent communities (needing sustainable livelihoods), others face unique threats (e.g., invasive species vs. climate change). So solutions must be tailored to each hotspot’s ecology, threats, and human factors.
# Answer:
Scientists can’t use one solution because biodiversity hotspots vary in: 1) Ecosystems (e.g., rainforests, coral reefs, Mediterranean scrublands) with unique species/habitats. 2) Threats (deforestation, overfishing, climate change, invasive species differ by region). 3) Socio - economic contexts (local communities, economies, policies vary). For example, a marine hotspot needs anti - overfishing measures, while a forest hotspot needs deforestation prevention. Solutions must address each hotspot’s specific ecology, threats, and human interactions.

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