Agroup of students designed an experiment to determine the effect of compost on the germination and growth of plants. the students set up experimental plots by mixing different ratios of soil and compost. they planted 20 pea and 20 melon seeds in each plot and watered each plot regularly. the students recorded the number of seeds that germinated, and as the plants grew, they recorded plant length, number and size of leaves, and g

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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.