Recent studies of DNA on both monocots and dicots indicates that the monocot and dicot distinction does not completely reflect the evolutionary relationship of both plant groups. Recent data suggests that the hypothesis of monocots form from a clade but reveals the species known as dicots are polyphyletic. This means that monocot could arise form a group of organisms that believed to evolved from a common ancestor. However, dicots are considered to arise from a loosely unrelated organisms descended from one or more ancestors.
"There is also the consumer viewpoint to consider: Consumers are increasingly leery of biotechnological techniques and the use of drugs such as antibiotics and growth hormones to increase production because there is a fear that these chemicals are passed on in the meat, milk, or eggs of the animal."
Large sheets of ice can cause erosion by moving the rocks beneath them. How can the rocks be weathered by ice?
D. Water gets into the cracks and expands as it freezes.
When water freezes, it expands. The ice then works as a wedge. It slowly widens the cracks and splits the rock. When ice melts, liquid water performs the act of erosion by carrying away the tiny rock fragments lost in the split.
The process is called freeze-thaw. 1st, liquid water gets into small holes or cracks in the rock (such as by rain or seawater splashing into them). 2nd, when the temperature drops this water will freeze into solid ice because ice occupies more room than water this state change puts pressure and tension on the surrounding rocks. 3rd, when the temperature increases again the ice will melt back into the water. It is this pressure increase and release that causes the rock to weather.