What is heterotroph?
in biology/

When a living organism must eat something else that is living (plants or animals) to get energy and nutrients.

Explanation:

must obtain energy + nutrients by taking in organic molecules, usually other living things this is commonly known as ingestion.

Hope this helped :)

An organism that cannot obtain their own food and has to dpend on others for their food are known as hererotrophs.

chordata is the answer