The graph shows the variation in the number of species in two different ecosystems over one hundred years.

Both ecosystems are in the same biome, and have undergone similar environmental changes during the period. Suggest a plausible reason to explain why the number of species in Ecosystem 2 has decreased significantly, while Ecosystem 1 has maintained a nearly stable number of species.

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

the growth of the plants is affected by the heat of the light. what is the student doing?