Which type of society existed for the longest time in human history?

a)hunter-gatherer societies
b)horticultural societies
c)pastoral societies
d)agricultural societies

Option A i.e Hunter-Gatherer Societies is the correct answer.

Hunting gathering was the first mode of subsistence in human history. In this mode of subsistence the man used to collect the wild plants or fruits and hunt the animals.

Hunting-gathering was the longest subsistence strategy employed by human societies. It began around 1.8 million years ago and ended around 10,000 years ago.

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

the current is 0.6

voltage ÷ resistance = current

so 12 ÷ 20 = 0.6