Glycolysis occurs in Cytoplasm
Answer: D) Pulmonary and aortic valves.
Explanation
There are two main heartbeats from a healthy heart.
The first beat is called the S1 or the lub, and it occurs when the atrioventricular valves (comprising the mitral and tricuspid valves) close.
The second beat is called the S2 or the dub, and it occurs when the semilunar valves (comprising the aortic and pulmonary valves) close.
Listening for heart beats is an essential part of cardiac auscultation.
The corrrect option is D.
Since the scientist was trying to determine if substance A affect the rate of reaction of X and Y, the best thing to do is to make substance X and Y to react together first, he should then measure the time taken for the reaction to take place. Next, he should make X and Y to react together again, but this time in the presence of A. The time taken for the reaction to occur should be measures. The scientist can now compared the two time measurements and decide if there are difference between them or not.
Answer: A) wastes
Explanation:
More people, more littering
Well to be fair no matter what happens, a will always happen no matter how wholly fold is chewed. However because chime is the byproduct of chewing and saliva. Your body must be able to break down the food into a smaller and easy to absorb form so if you can't do it with the mouth, the stomach is just going to have to do the job.
So "D" is the correct answer