Question

why do all animals need to eat other organisms, but plants do not?

• plants make their own sugar, but animals must get it from other organisms.
• plants can make all of their own nutrients and sugar, but animals must get them from other organisms.
• plants cannot move, but animals can, so plants must get their nutrients from the soil.
• plant cells are simpler than animal cells, so they need fewer nutrients and are able to absorb them from the soil.

Explanation:

To solve this, we analyze each option:

• Option 1: Plants make sugar via photosynthesis, but they also need other nutrients (like minerals from soil), so this is incomplete.
• Option 2: Plants are autotrophs—they can synthesize their own organic nutrients (like glucose) and also obtain inorganic nutrients (e.g., from soil). Animals are heterotrophs and must consume other organisms for nutrients. This matches the biological concept of autotrophy (plants) vs. heterotrophy (animals).
• Option 3: Movement is not related to nutrient acquisition method (plants get nutrients from soil and air, animals from consuming, not just movement).
• Option 4: Plant cells are not "simpler" in a way that reduces nutrient needs; they have unique structures (like chloroplasts) and still need a full range of nutrients, just acquired differently.

Answer:

B. Plants can make all of their own nutrients and sugar, but animals must get them from other organisms.