13. As the frequency goes higher than 6 KHz, what must happen in order for the person to hear the sounds? *
1 The person needs to focus more and pay better attention to the test.
O
There does not need to be any changes to the sound for the person to hear those
frequencies.
O The amplitude (or volume) must be increased.
O The amplitude (or volume) must be decreased.

The correct answer is: making up measurement to record

1. true.2. true.3. true.4. false.5. true.the concept of darwin's theory of evolution involves the idea that there are limited resources in a given living environment and that the organisms which live within have variations in their genetic make up due to random mating. the ones with beneficial genetic variations can express certain traits which give them an upper hand in surviving and reproducing in the said environment compared to ones who may have a more disadvantageous variation in traits. over time, the organisms with an upper hand will survive and reproduce more frequently and pass on their beneficial genes while the others die. the result is evolution, where we observe (usually, but not always) eventually, phenotypic distinct changes.

They create genetic variations