Biologists can divide living organisms into two groups:autotrophs and heterotrophs, which differ in _________.

• A. Their method of obtaining energy.
• B. The characteristics of life.
• C. Their mode of inheritance.
• D. The way that they generate ATP.

Answer: (A)

Verified step by step guidance

1. Understand the definitions of autotrophs and heterotrophs. Autotrophs are organisms that can produce their own food using light, water, carbon dioxide, or other chemicals. Heterotrophs cannot synthesize their own food and rely on other organisms — both plants and animals — for nutrition.
2. Consider the primary difference between autotrophs and heterotrophs. Autotrophs obtain energy through photosynthesis or chemosynthesis, while heterotrophs obtain energy by consuming organic matter.
3. Evaluate the options given in the problem: 'Their method of obtaining energy', 'The characteristics of life', 'Their mode of inheritance', and 'The way that they generate ATP'.
4. Analyze which option directly relates to the fundamental difference between autotrophs and heterotrophs. Focus on how each group obtains energy.
5. Conclude that the correct answer is related to the method of obtaining energy, as this is the primary distinction between autotrophs and heterotrophs.