Cud someone give me 2 examples of the doppler effect?

I'm going to quote something that might help you...

"The Doppler effect is the apparent change in the frequency of a wave motion when there is relative motion between the source of the waves and the observer. Well known examples include the change in pitch of an ambulance or police siren, as it approaches and then recedes from you, or the same effect from a passing train."

This is not mine I am simply quoting something that might help you.

Here is your

Doppler effect is a high pitch sound such as...

1. An Ambulance with its sirens on.

2. Also an blow horn being blowned.

Microfilaments carry out cellular movements such as contraction and cytokinesis however microtubules are cylindrical tubes which act as a scaffold to find cell shape, gives a set of "tracks" for cell organelles to move on.