Question

squid are fast swimmers. they are good at catching prey. since ← joining word ① combine the sentences into one sentence. use the joining word. type your answer here.

Explanation:

To combine the sentences, we use the joining word "since" to show the reason - effect relationship. The first sentence "Squid are fast swimmers" gives the reason, and the second "They are good at catching prey" is the effect (or we can also think of it as the first being the reason for the second). So we structure it as "Squid are good at catching prey since they are fast swimmers." or "Since squid are fast swimmers, they are good at catching prey." (both are correct, but the first structure is more in line with the order of the original sentences in terms of the reason - effect flow when using "since" in the middle).

Answer:

Since squid are fast swimmers, they are good at catching prey. (or Squid are good at catching prey since they are fast swimmers.)