5. Expresa tu opinión sobre: -los diferentes mecanismos o estrategias que usan algunas especies para la supervivencia ante los escases de
recursos como el agua, la luz, el alimento y ante las inclemencias del clima.
-Sobre la necesidad de que en un ecosistema sea necesario la presencia de depredadores.
6. Resuelve el crucigrama sobre los tipos de relaciones entre los ecosistemas. es naturales

maybe because its impossible for balloons to lift a whole entire house.

a compound light microscope is used to magnify objects in steps.  

hope it

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.