1 Collegedata.com says, âThe College Board reports that the average cost of room and board in 2014â2015 ranged from $9,804 at four-year public schools to $11,188 at private schools,â but doesnât break down whatâs room and whatâs board.2  A USA Today article quotes the same figures. Collegedata.com says, âThe College Board reports that the average cost of room and board in 2014â2015 ranged from $9,804 at four-year public schools to $11,188 at private schools,â but doesnât break down whatâs room and whatâs board. 2  A USA Today article quotes the same figures.
B. Leaves is a modification into the spine in a cactus plant. they are modified leaves. Being narrow and sharp not only helps defend the plant but also the reduced surface area helps limit water loss. [ [ ] ]. Expert answered| patmarone |Points 5452|.
In most species of cacti the leaves have evolved into spines which not only defend the cactus against herbivores but also provide shade that lowers the plant's water loss through transpiration. The spines grow from specialized structures called areoles, homologous to the nodes on other plants.n most species of cacti the leaves have evolved into spines which not only defend the cactus against herbivores but also provide shade that lowers the plant's water loss through transpiration. The spines grow from specialized structures called areoles, homologous to the nodes on other plants.