1) they have similar chemical properties.
for example fluorine from the 17th column is a non metal so does all the elements of that group.
2)they have same valence electrons in their outermost shell
example
electronic configuration of
hydrogen 1, lithium 2,1, sodium 2,8,1 and so on.
3) have same valency.
Photosynthesis happens when plants use the energy of the sun and other reactants to produce sugar and water that they need to survive. The reactants of photosynthesis are energy, carbon dioxide, and water. The products are glucose and oxygen.
<span>Energy (Sun) + CO2 (Carbon dioxide) + H2O (Water) -> C6H12O6 (Glucose) + O<span>2 (Oxygen).
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Photosynthesis is generally performed by various plants and bacteria.
Your answer should be A. by observing the formation of sedimentary rocks.
The vas deferens are a fibromuscular tube which connect to the epididymis, and is an excretory duct of the testis.
Hope I could help! :)