Https://quizlet.com/64950499/ap-bio-semester-1-flash-cards/?i=manjs&x=1jqY
this quizlet should help you. it has majority of the answers. :)
Answer:

point mutation, change within a gene in which one base pair in the DNA sequence is altered. Point mutations are frequently the result of mistakes made during DNA replication, although modification of DNA, such as through exposure to X-rays or to ultraviolet radiation, also can induce point mutations
Speed of sound in water = 1500 m/s
frequency = 20Hz
wavelength = s/f = 1500/20 = 75m
I’m not sure but I’m guessing the answer would be the first one !
It copies, hope this helps