Other scientists suggest that plants, like animals, 13 resources—nutrients, water, space, and light.
答案：(B) compete for
【句型】compete for 字詞搭配「競爭……」，表示植物像動物一樣「競爭」資源；get over（克服）、give way to（讓位給）、make up for（彌補）都不合。
compete 你比較熟的是 compete with／against sb（與某人競爭），所以看到 compete for 會愣一下。兩個介系詞分工其實很清楚：with／against 後面接對手，for 後面接爭奪的東西。 compete for resources 就是「爭奪資源」。
空格後接的是 resources—nutrients, water, space, and light（資源：養分、水、空間、光），這是被爭奪的東西不是對手，所以用 for。下一句 there is intense struggle for these resources（對這些資源有激烈的爭奪）再次確認，連介系詞 for 都一樣。
get over 是「克服；從生病或難過中恢復」（get over a cold 感冒痊癒）；give way to 是「讓位給、被……取代」，主詞會被取代掉，但植物並沒有消失；make up for 是「彌補」，後面接缺憾不接資源。
compete for sth（爭奪……）、compete with／against sb（與某人競爭）、competition for resources（資源競爭）、competitive edge（競爭優勢）、get over（克服；恢復）、give way to（讓位給）、make up for（彌補）。
In certain forests, when you look up you will see a network of cracks formed by gaps between the outermost edges of tree branches. It looks like a precisely engineered jigsaw puzzle, each branch growing just perfectly so it almost, 11 , touches the neighboring tree. This beautiful phenomenon is called crown shyness.
Scientists have been discussing crown shyness since the 1920s, proposing 12 explanations for the phenomenon. Some researchers point out that as trees often grow close together, treetops can easily collide and break when swayed by the wind. In order to protect their branches from breakage, trees maintain "shyness gaps"—spaces large enough to prevent them from touching their neighbors.
Other scientists suggest that plants, like animals, 13 resources—nutrients, water, space, and light. In forested areas with thick tree crowns, there is intense struggle for these resources. Gaps in the treetops resulting from crown shyness may allow trees to increase their 14 light and enhance photosynthesis. Additionally, by having branches that do not touch those of their neighbors, trees may be able to limit the spread of leaf-eating insects, and potentially also the transmission of diseases from tree to tree.
15 decades of investigation, there is no consensus on exactly what causes the beautiful and mysterious phenomenon of crown shyness.