what statement describes the 1st step of ecological community it is known as?

Question

A. reed plants attract dragonflies and mayflies.
B. frogs and snakes arive after emergent plants are established.
C.climax trees such as ash and beech appear and eventually dominate the area.
D. microscopic producers such as blue green algae and phytoplankton live on the lake surface

Answer 1

http://www.ehow.com/list_7248745_steps-primary-secondary-succession.html