D) The AV valves are supported by chordae tendineae so that they do not blow back up into the atria during ventricular contraction.
I agree with the other person you answered the answer is B duckweed growth
Answer:
A. The wavelength increase
Explanation:
The wavelength should increase if the frequency of a sound increases.
??? (Sorry if this is wrong)
No it is native to Southwestern Russia,The caucasus , and turkey. Despite its name, it is not native to Siberia