Questions

When backed by buying, power wants become demands. 

Photoautotrophs are those organisms that can make their own food using sun light with the help of the process of photosynthesis.

Plants can prepare their own food using sunlight. Hence they are Photoautotrophs.

The ability of two or more substances to combine to form other substances is called Reactivity.

The 828-metre (2,717 ft) tall Burj Khalifa in Dubai has been the tallest building since 2008.

BSF - Border Security Force

The motto of the organization BSF is "Duty unto Death."

In animals, parthenogenesis means development of an embryo from an unfertilized egg cell. In plants parthenogenesis is a component process of apomixis.Apogamy is a type of reproduction, occurring in some ferns, in which the sporophytedevelops from the gametophyte without fusion of gametes.Adventitious embryony also called sporophytic budding, is a type of apomixis in which an embryo develops directly from nucellus or integument tissue.So, all three are correct.