Multiple Choice
In his studies of natural selection, which animals did Charles Darwin famously observe and describe on the Galápagos Islands, leading to important insights about evolution?
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1. Introduction to Biology
Natural Selection and Evolution
Multiple Choice
During ecological succession, what typically happens to the average size of plants in a community over time?
A
The average size of plants remains constant throughout succession.
B
Plant size fluctuates randomly with no clear pattern during succession.
C
The average size of plants increases as succession progresses.
D
The average size of plants decreases as succession progresses.
Verified step by step guidance1
Understand the concept of ecological succession: Ecological succession is the process by which ecosystems change and develop over time. It involves a gradual replacement of one community by another, leading to changes in species composition, structure, and function.
Recognize the types of succession: Succession can be primary (starting from bare substrate, like after a volcanic eruption) or secondary (starting from a disturbed area where soil is already present, like after a forest fire). Both types involve changes in plant communities over time.
Analyze the progression of plant communities: Early stages of succession are typically dominated by small, fast-growing pioneer species (e.g., grasses and herbs) that can quickly colonize the area. These plants are usually smaller in size and require fewer resources.
Understand the later stages of succession: As succession progresses, larger plants such as shrubs and trees begin to dominate. These plants require more resources but are better competitors for light, water, and nutrients. This leads to an increase in the average size of plants in the community.
Conclude the pattern: The average size of plants increases as succession progresses because the ecosystem becomes more stable and supports larger, more competitive species. This is a predictable pattern observed in ecological succession.
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