23. When the sperm cell then meets the egg, the 23 chromosomes that each sex cell have form the 46 total chromosomes that each human being has.
C. 20 because 39-19 is 20 so there are 20 neutrons and the atomic number is the same as number of protons and electrons.
Data are usually used to organize the information graphs are created from data tables they allow the investigator to have a image of their observations they can always see what they recorded on their graphs and tables thats mainly the reason why just to be organized!!
Answer:
Nitrogen cycle works through various stages like, nitrogen fixation, nitrification, assimilation, ammonification, denitrification etc. It is a building block for protein and DNA
Explanation:
Nitrogen is an element abundantly found in the atmosphere, also its building block for proteins as well as nucleic acid i.e. DNA formation. In nitrogen cycle , the nitrogen is being prepared from inert nitrogen. The nitrogen cycle has several processes like nitrogen fixation, in this the inert nitrogen is being converted to organic nitrogen with the help of certain micro-organism.
Nitrification, plants cannot absorb directly nitrogen so bacteria help the plants to convert the nitrogen into ammonia form in this stage. Assimilation, another stage in which plants starts absorbing various forms of nitrogen from the soil.i.e. nitrate, nitrite and ammonium. Ammonification, here plants and animals have nitrogen in there body after death various microbes help in decomposition in this stage. Denitrification, in this stage the return back of nitrogen takes place.