Answer:
Bill is to law what larva is to insects.
Step-by-step explanation:
This statement is an analogy. An analogy is a comparison made between things that have similar features to help explain a principle or idea.
In this case, the comparison is made to explain that just like "larva" refers to the early stage of growth that some insects and amphibians undergo before becoming into adults, a bill is also an early or "baby" version of a law, while a law itself is the final or adult version of that bill, that is to say, the version that is fully developed and can be enforced.