Ok i just took this exam the above answer was wrong the real answer should be: More investigations must be completed.
Hey there! :)
The answer to this question is reproduction. Reproduction is the process in which an organism's dna is used to create a new, fully functioning organism. There are two main kinds of reproduction, which are sexual reproduction (ex. humans, dogs, whales, etc) and asexual reproduction (ex. ferns, flowers, trees)
I hope this helps!
~kaikers
Darn I really wish I would welp you but I can that one is pretty hard