Answer:
Lord John wanted to capture a Pterodactyl and take it back to England to show the world that the claims made by Professor Challenger were true.
Step-by-step explanation:
The question concerns the novel, The Lost World, written by Sir Arthur Conan Doyle. The novel is an adventure of four men into the lost world of South America where a world of dinosaurs was established.
In the book, Lord John Roxton wanted to capture a Pterodactyl and take it back to England because he wanted to show it as a proof to Professor George Challenger's claim that dinosaurs still exist in a remote part of the world.
The textual evidence is,
"‘Don’t you think other people besides Professors can
want to know things?’"