Explanation

Affection, while important, is considered a secondary or social drive

Because it relates more to emotional and social needs rather than basic physiological survival.

Explanation

An adverb of frequency is used to indicate how often something happens (e.g., always, often, rarely, never).

It answers the question "How often?"

Explanation

 Declarative sentences, which make a statement, typically end with a full stop (.)

The period (.) is placed at the end of declarative sentences, statements thought to be complete, and after many abbreviations.

Explanation

غزل "شم وحی" کلیم  الدین احمد کی ہے

اور یہ پہلی بار 1954 میں شائع ہوئی تھی۔

Explanation

The Agulhas Current is formed by the confluence of the warm Mozambique

And East Madagascar Currents, which meet south-west of Madagascar

The net transport is estimated as 100 Sv.

The topography directs the flow of the Agulhas Current. 

 It is suggested that it is the largest western boundary current in the world ocean,

Explanation

Water is the only known non-metallic substance that expands when it freezes

its density decreases and it expands by approximately 9% by volume.

Explanation

Scratch my back and I'll scratch yours means If you do me a favor, I'll return it."

Explanation

Many eukaryotes are unicellular organisms that, like bacteria,

They consist of only single cells capable of self-replication. 

Plasmids and bacteriophages can replicate within bacterial cells independent of the control of chromosomal DNA.

Explanation

The concept of the 'invisible hand' was introduced by Adam Smith.

It describes how individuals pursuing their own self-interest unintentionally contribute to the overall economic well-being of society.

Explanation

Big history refers to the scope from the Big Bang to the Present a period of 13.8. billion years

It integrates information from cosmology, geology, biology, and history to understand the universe and human history as a whole.