Energy comes to the earth surface in the form of sunlight. When the sunlight strikes the earth surface, some energy is absorbed by the earth through vegetation in the process of photosynthesis, while more are reflected back into the space but these light radiation trapped by greenhouse gases such as carbondioxide, methane and nitrous oxide etc which increases the temperature and causes global warming which changes our climate.
Amoeba reproduces by asexual reproduction method - binary fission. After replicating its genetic material through mitosis, the cell divides into two independent equal sized daughter cells.