Practice Test : Reading section
Passage 1 Even a muddy pond contributes to the ecosystem that affects the environment. A vernal or springtime pool is only a few feet deep and lasts only from March until midsummer but yields a considerable number of diverse life forms. Like all of nature, there are predators and victims, and a particular living being may be one or the other, depending on its age and characteristics. One may find masses of spotted salamander eggs floating just under the surface of the pond, left behind by adults who entered the pond early in the season before predators arrived. Other amphibians and reptiles return to the recurrent pond year after year to reproduce, as their ancestors have done for years. Various forms of algae grow well in the murky water, if there is sufficient sunlight. They in turn produce and transmit oxygen to the salamander embryos and other young that are not yet able to survive outside of water. Diving beetles feast on eggs and larvae deposited in the pond by the salamand