The combination is square circle star triangle if you look closely those shapes are on their hats
A, with intentional contrast, the artist is trying to draw emphasis on something.
Answer:
Target plant biomass decreased and neighbor plant root biomass increased.
Explanation:
As the percentage of a target plant's tube open to neighbors' roots increased, <em>target plant biomass decreased and neighbor plant root biomass increased</em>. The study was designed to investigate the relationship between neighbor root biomass and belowground competition. When the number of target plant's tube open to neighbors' roots increased, target plant biomass decreased and neighbor plant root biomass increased.
The answer to your question is the 4th one
