Question

complex sentences
fill in the blank.
i rode in a boat when i visited europe.
the conjunction in the middle means _?_.
two periods are needed
a question mark is needed
no comma is needed

Explanation:

In the sentence "I rode in a boat when I visited Europe", the conjunction "when" is used to connect two clauses. When a dependent clause (here, "when I visited Europe") follows an independent clause ("I rode in a boat"), no comma is needed. If the dependent clause came first, a comma would be required.

Answer:

no comma is needed