咩都冇ge cert= =
ps. oh my god!!
ps2. ........
compare & contrast the occurrance & significance the development of negative pressure in plant and animal. (10 M)
occurrance:
animal : a reduced pressure in the relaxing atria
plant : a pressure in the leaves during evaporation of water
significance:
animal : draw blood along the veins back to the heart
plant : to draw the water along the stems to the leaves
我諗左呢d= =.....有冇咩意見? |