Which of the following is listed as a similarity between all living things?

• A. Are made of cells
• B. Move using muscles
• C. Have chloroplasts
• D. Reproduce only sexually

Answer: (A)

All living things share the presence of cells as their basic building blocks. The idea behind cell theory is that cells are the fundamental units of life, and every organism is made of one or more cells, with new cells arising from existing ones. This explains why a wide range of life—from bacteria to plants to animals to fungi—fit under the same umbrella: their life processes occur within cells and rely on cellular organization. Other statements aren’t universal for all living things: movement using muscles isn’t found in every organism, chloroplasts are present only in photosynthetic organisms like plants and some algae, and many organisms can reproduce asexually, not just sexually.