14. Fish are the most ancient form of vertebrate life, and ..... all other vertebrates. From them evolved Evolved them To evolve They are evolved

Sure, let's break it down step by step:

1. Identify the context of the sentence: The sentence is discussing the evolution of vertebrates, starting with fish as the most ancient form.

2. Understand the structure: The sentence has two parts:

   • "Fish are the most ancient form of vertebrate life, and ..... all other vertebrates."
   • The second part should logically follow the first part, indicating a relationship of evolution.

3. Analyze the options:

   • "From them evolved": This phrase correctly indicates that other vertebrates evolved from fish. It fits the context and maintains proper grammatical structure.
   • "Evolved them": This phrase is grammatically incorrect and does not fit the context.
   • "To evolve": This phrase is incomplete and does not fit the context.
   • "They are evolved": This phrase is grammatically incorrect and does not fit the context.

4. Choose the correct option: Based on the analysis, the correct option is "From them evolved".

So, the complete sentence is: "Fish are the most ancient form of vertebrate life, and from them evolved all other vertebrates."