What or how have we changed psychology to ensure it is now more scientific than it was historically? Why were those changes
made?

Psychology took so long to emerge as a scientific discipline because it needed time to consolidate. Understanding behavior, thoughts and feelings is not easy, which may explain why it was largely ignored between ancient Greek times and the 16th century. ... Wilheim Wundt developed the first psychology lab in 1879.

Nechropagous insects, otherwise a.b means they eat both meat and plantc means they only eat meatd is that their native to that area(correct one) a is feeding off of remains.