Multiple Choice
Which term best describes the process in which each new biological community modifies the environment, making it suitable for the next community to establish?
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1. Introduction to Biology
Natural Selection and Evolution
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In the context of natural selection and evolution, which of the following best describes the trophic level of most bird species?
A
Secondary consumers
B
Primary consumers
C
Decomposers
D
Producers
Verified step by step guidance1
Understand the concept of trophic levels: Trophic levels represent the position of organisms in a food chain. The primary levels are producers, primary consumers, secondary consumers, and decomposers.
Define each trophic level: Producers (e.g., plants) create energy through photosynthesis. Primary consumers (e.g., herbivores) eat producers. Secondary consumers (e.g., carnivores or omnivores) eat primary consumers. Decomposers break down organic matter.
Consider the diet of most bird species: Many birds are carnivorous or omnivorous, feeding on insects, small mammals, or other animals, which places them in the secondary consumer category.
Eliminate incorrect options: Birds are not producers because they do not create energy through photosynthesis. They are not decomposers because they do not break down organic matter. While some birds may eat plants, most are not exclusively primary consumers.
Conclude based on evidence: Based on their diet and role in the food chain, most bird species are best described as secondary consumers.
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