Multiple Choice
Which characteristic of life is most directly illustrated by the statement: "I have so much more energy when I work out on a regular basis. I need to do it more often!"?
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1. Introduction to Biology
Characteristics of Life
Multiple Choice
Which of the following best explains why hummingbirds have relatively large hearts compared to their body size?
A
To store extra oxygen for long periods of inactivity
B
To support their high metabolic rate required for rapid wing movement
C
To regulate their body temperature in cold environments
D
To help them float in the air by increasing buoyancy
Verified step by step guidance1
Understand the relationship between heart size and metabolic rate: Animals with high metabolic rates require larger hearts to pump oxygen-rich blood efficiently to their tissues.
Recognize that hummingbirds have a high metabolic rate due to their rapid wing movement, which requires a constant supply of energy and oxygen.
Eliminate incorrect options: Storing extra oxygen for inactivity is not relevant because hummingbirds are highly active. Regulating body temperature in cold environments is not directly related to heart size. Increasing buoyancy is unrelated to the function of the heart.
Focus on the correct explanation: The large heart of a hummingbird supports its high metabolic rate by ensuring sufficient oxygen delivery to sustain rapid wing movement.
Conclude that the correct answer is: 'To support their high metabolic rate required for rapid wing movement.'
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