Which sound would most likely have the lowest pitch?
a bird chirping
a vacuum-cleaner running
a lawn mower running
a dog barking

It would most definitely be a lawn mower

a vacuum- cleaner running.

The frequency at which the sound waves resonate or vibrate is the pitch of the sound. Pitch is a perceptual property of sound. It allows us to judge the quality of sound as high or low. A vacuum- cleaner running is an example of low pitch because it is an electrical instrument, which is used for cleaning purpose in household and offices. The sound of vacuum cleaner remains same during the working process. It's pitch remains low and constant through out the working process. On the other hand, the pitch of bird, a lawn mower runner and a dog barking usually remains high.

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

i think it’s c but i might be wrong. if i am let me know! have a good rest of your day as well!