2. It is the cause of skin cancer.
3. It effects on our eyes.
4. It effects on our health.
concept of continuum. in macroscopic approach of thermodynamics the substance is considered to be continuous whereas. every matter actually comprises of myriads of molecules with intermolecular spacing amongst them. for analyzing a substance in aggregate it shall be desired to use laws of motion for individual
the answer is land bridges existed between the continents. alfred wegener originated the continental drift theory. according to theory, the world was a single compressed protocontinent initially and later drifted away to different continents as it is today. he called protocontinent as pangaea, means all lands. to support theory, he put forward another paper saying that a land bridge once existed between brazil and africa and so there are similar fossilised plants and animals in the two countries.