Final answer:
If a sponge is considered an animal, the statement 'Sponges eat other organisms' must be true.
Step-by-step explanation:
If a sponge is considered an animal, then the statement 'Sponges eat other organisms' (Option A) must be true. Sponges are filter feeders, meaning they pump water through their bodies to obtain food particles such as bacteria, which are then filtered out by specialized cells known as collar cells. These collar cells digest the food and distribute the nutrients to the rest of the body.
Option B ('Sponges make their own food') is not true because sponges do not have the ability to photosynthesize like plants. Option C ('Sponges move all the time') is also not true because sponges are sessile, meaning they are fixed in one place and do not have the capability to move. Option D ('Sponges have a backbone') is not true since sponges are invertebrates, meaning they do not have a backbone.