Answer: B
Explanation: The density of a material affects the speed that a wave will be transmitted through it. In general, the denser the transparent material, the more slowly light travels through it. Glass is denser than air, so a light ray passing from air into glass slows down.
Reproduction-the ability of living organisms to reproduce.
Respiration- a process in living organisms involving the production of energy.
Option C is correct. Frequency can be found by counting the number of troughs per second in a wave diagram.
<h3>What is the frequency?</h3>
Frequency is defined as the number of repetitions of waves occurring in 1 second. It can also be said that Frequency is defined as the number of cycles completed in 1 second.
Frequency is given by the formula as,
Hz.
Hence option C is correct. Frequency can be found by counting the number of troughs per second in a wave diagram.
To learn more about the frequency refer to the link;
brainly.com/question/4393505
Since it changes from what it originally was into a harder compound, it is a metamorphic type of rock.