Here's a short story:

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. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: What is this article about?
Guess: Ctenophora
Confidence: <appropriate level of confidence in this guess>

Question: Where is this word derived from?
Guess: the Greek κτείς kteis 'comb' and φέρω pherō 'carry
Confidence: <appropriate level of confidence in this guess>

Question: What are they known as?
Guess: comb jellies
Confidence: <appropriate level of confidence in this guess>

Question: What makes them unique?
Guess: the comb like cilia
Confidence: <appropriate level of confidence in this guess>

Question: How do they move? By using what?
Guess: They move using Cilia
Confidence: <appropriate level of confidence in this guess>

Question: Are there any similar creatures?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: What are they called?
Guess: Cnidarians
Confidence: <appropriate level of confidence in this guess>

Question: What are they made of?
Guess: consist of a mass of jelly
Confidence: <appropriate level of confidence in this guess>

Question: What do they use for breathing?
Guess: water flow
Confidence: <appropriate level of confidence in this guess>

Question: Does the ocean help them digest food?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: How big do they get?
Guess: It ranges.
Confidence: <appropriate level of confidence in this guess>

Question: What are the smallest?
Guess: A few millimeters
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: The biggest?

4ft 11 in