In an ecosystem the growth and survival of organisms are dependent on the availability of the energy from the sun. the energy is available to organism in the ecosystem because a. all organisms in a food web feed on autotrophs b. consumers have the ability to transfer chemical energy stored in bonds to plants c. all organisms in a food web have the ability to use light energy d. producers have the ability to store energy from light in organic molecules

the most common type of reef is the fringing reef. this type of reef grows seaward directly from the shore. they form borders along the shoreline and surrounding islands.

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.