Many cultures and religions have customs which deal with the way they use the land. for example, in judaism, it is required that a field be left fallow (unplanted) every seventh year. what is one beneficial effect of customs like this? a) they prevent the land from being overused. b) they cause less competition among farmers. c) they make the land more valuable to farmers. d) they force people to farm more recklessly at other times.

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.

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