What type of circuit has the ability to have individual parts that can be turned off without affecting the entire circuit
a- open circuit
b-series circuit
c- combination circuit
d-parallel circuit

A parallel circuit

Explanation:

In a parallel circuit individual parts can be turned off without affecting the entire circuit.

c)as speed changes, wavelength and frequency change.

everything changes!

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.