Answer:
because it is also created from the father not only one of them
Roots absorb nutrients and water from the soil, as well as keep the plant attached to the ground. Some plants also use the roots, to parasite other plants (ie, Mistletoe) or reproduction (Potatoes).
Stems, transport water and nutried to the plants up reaches, sometimes they are important for protection, as they are covered in thorns or toxins.
Branches sort of form the same function as stems, only they branch out from the stem.
Leaves, are where the plant conducts its metabolic photosynthetic processes. Sometimes the leaves are also important for protection (the thorns of cacti are actually leaves).
Flower, are useful for reporduction, giving out pollen and when combined with other pollen are turned into fruits.
Fruits are the protective object of the seed, and provide nutrition for the seed, a means of seed dispersion, and lastly protection from outside forces.
Answer:
The water molecule has a slight negative charge near its oxygen atom and a slight positive charge near its hydrogen atoms, but when a neutral molecule has a positive area at one end, and a negative area at the other, it's called a polar molecule.
Hope this helps!
Conceptually, one can define three generations of renewables technologies, reaching back more than 100 years .
First-generation technologies emerged from the industrial revolution at the end of the 19th century and include hydropower, biomass combustion and geothermal power and heat. Some of these technologies are still in widespread use.
Second-generation technologies include solar heating and cooling, wind power, modern forms of bioenergy and solar photovoltaics. These are now entering markets as a result of research, development and demonstration (RD&D) investments since the 1980s. The initial investment was prompted by energy security concerns linked to the oil crises (1973 and 1979) of the 1970s but the continuing appeal of these renewables is due, at least in part, to environmental benefits. Many of the technologies reflect significant advancements in materials.
Third-generation technologies are still under development and include advanced biomass gasification, biorefinery technologies, concentrating solar thermal power, hot dry rock geothermal energy and ocean energy. Advances in nanotechnology may also play a major role.
