Answer:
The correct option is D) The birds have different mating seasons.
Explanation:
Organisms belonging to the same species will have the ability to reproduce and produce fertile offsprings. As the birds have different mating seasons, this means that the birds are not able to mate and reproduce at the same time. Thus phenomenon supports the second student's argument.
Answer:
0.091 m/s
Explanation:
Given in the question that,
wavelength of a wave = 7mm
frequency of a wave = 13 hertz
Formula to use
<h3> f = v / λ </h3>
here f = frequency in hertz
v = velocity in m/s
λ = wavelength in m
1 mm = 1x10
7mm = 7x10
Plug values in the formula
13 = v / 7x10
v = 13(7x10^{-3})
v = 0.091 m/s