The variation in pea plants is most likely due to: 1) Variations in the weather.
2) Variations in the genetic code within the pea plants.
3) Variations in the amount of sunlight each pea plant received.
4) Variations in the experimental procedure.

they each offer a fresh glut of resources to the organisms that can arrive and exploit them. as individuals and new species continue to appear, they actively and passively alter the environment. competition for shared resources increases, local abiotic and biotic conditions shift, and the relative abundances of species change accordingly. the process is called ecological succession, and it is one of the earliest and most well-known concepts in ecology.

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck