Answer:
True
Explanation:
Papillary muscles are the muscles that project out from the walls of the ventricles of the heart. These muscles are attached to the AV valves with the help of chordae tendineae. During the contraction of ventricles, the higher blood pressure closes the AV valves by driving the edges of these valves towards each other. At this time, the contraction of Papillary muscle pulls on and makes the chordae tendineae rigid and right. This does not allow the cusps of the AV valves to ever into the atria in the response to higher blood pressure in ventricles.
D) the expiraments cannot last billions of years as it did earlier on
Answer:
he population in Trait A has a higher percentage of plants
I don’t quite understand what your asking but if your asking if it’s a mystery then no it isn’t but if this was not the answer you were looking for I suggest you put it another way that makes more sense