Answer:
Four.
Explanation:
Helen Fisher describes romantic love "as a very primitive, basic human emotion as basic as fear, anger or joy". She explained that men and women in prehistoric times who were in love were bound together in preparation for child bearing. But, after four years of raising a child through infancy, the love that once existed begins to wane. The couples tend to break up and search for new partners.
In an Ionic bond, a metal donates an electron and a non-metal recieves an electron. In a covalent bond, electrons are shared between two non-metals
Answer:
Option-3
Explanation:
Hybridisation is an artificial process which is performed by humans to form a product by the combination of genes.
The genes or trait of desire are selected from two different organisms as a result of which a new hybrid organism is formed which contains the selected traits of organisms. The hybridisation can also be termed as the selective breeding and was practised by the humans from 10,000 years ago.
Since the hybridisation produces the infertile offspring as it produced artificially therefore Option-3 is correct.