Why does the frog sciatic nerve give a graded response?

The sciatic nerve of the frog is constituted of a bundle of nerve fibers. Each of the nerve fiber has a varying threshold for which the membrane potential is disturbed. This is the reason why graded potential is observed as each nerve fiber depolarizes until a threshold in the sciatic nerve ( following summation of all individual depolarization events) is reached to trigger an action potential.

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: