Ctenophora (/tᵻˈnɒfərə/; singular ctenophore, /ˈtɛnəfɔːr/ or /ˈtiːnəfɔːr/; from the Greek κτείς kteis 'comb' and φέρω pherō 'carry'; commonly known as comb jellies) is a phylum of animals that live in marine waters worldwide. Their most distinctive feature is the ‘combs’ – groups of cilia which they use for swimming – they are the largest animals that swim by means of cilia. Adults of various species range from a few millimeters to 1.5 m (4 ft 11 in) in size. Like cnidarians, their bodies consist of a mass of jelly, with one layer of cells on the outside and another lining the internal cavity. In ctenophores, these layers are two cells deep, while those in cnidarians are only one cell deep. Some authors combined ctenophores and cnidarians in one phylum, Coelenterata, as both groups rely on water flow through the body cavity for both digestion and respiration. Increasing awareness of the differences persuaded more recent authors to classify them as separate phyla.

Answer the following questions:
1. What is this article about?
2. Where is this word derived from?
3. What are they known as?
4. What makes them unique?
5. How do they move? By using what?
6. Are there any similar creatures?
7. What are they called?
8. What are they made of?
9. What do they use for breathing?
10. Does the ocean help them digest food?
11. How big do they get?
12. What are the smallest?
13. The biggest?
14. Where are they found?
15. Are they found on land?
16. Are they only found in the ocean?
17. What is the main difference between the two creatures?

Numbered answers:
1. Ctenophora
2. the Greek κτείς kteis 'comb' and φέρω pherō 'carry
3. comb jellies
4. the comb like cilia
5. They move using Cilia
6. yes
7. Cnidarians
8. consist of a mass of jelly
9. water flow
10. yes
11. It ranges.
12. A few millimeters
13. 4ft 11 in
14. worldwide
15. No
16. No
17. In ctenophores, these layers are two cells deep, while those in cnidarians are only one cell deep