You heard me before, and then again. afterward i die, until you call me again. what am i?

You are a echo. echos you hear once then they bounce off an object and then come back. and then there gone. unless you talk agian

You heard me before, and then again. Afterward I die, until you call me again. What am I?                                                                                                                                                                                                                                       The answer is "Echo"

What is your question?

Psychologists often talk of the magical number "7" - so it is generally assumed that we can keep 7 (more or less, so 5-9 is the correct answer) items in our short term memory - we know this as a result of many experiments.

we can increase this by chunking, so for example "7 8 9 5 3" is harder to remember than "78 95 3" - try it yourself!

the answer is a)