In the following question, a part of the sentence (a word or phrase) has been highlighted in bold. Four different ways of writing the word or phrase have been given in the options (1), (2), (3), and (4). Find the correct replacement of the given bold word or phrase. If the given word or phrase is grammatically correct, then select option (5).
New research has revealed that plants secretly talk and share resources from each other by using fungal networks present in their roots.
1
with each plant
2
by each other
3
for each tree
4
with each other
5
No improvement needed