Why are humans classified as heterotrophs?

• A. Because they obtain energy by consuming other organisms.
• B. Because they rely solely on inorganic substances for energy.
• C. Because they can convert sunlight into chemical energy.
• D. Because they can produce their own food through photosynthesis.

Answer: (A)

Verified step by step guidance

1. Understand the definition of heterotrophs: Heterotrophs are organisms that cannot produce their own food and must obtain energy by consuming other organisms.
2. Consider the characteristics of humans: Humans consume plants and animals to obtain energy, which aligns with the definition of heterotrophs.
3. Evaluate the options: The first option states that humans obtain energy by consuming other organisms, which matches the definition of heterotrophs.
4. Analyze the incorrect options: The second option suggests reliance on inorganic substances, which is characteristic of some autotrophs, not heterotrophs. The third and fourth options describe processes like photosynthesis, which are typical of autotrophs, not heterotrophs.
5. Conclude that humans are classified as heterotrophs because they obtain energy by consuming other organisms, as stated in the first option.