Answer:
Carbohydrate and protein
Explanation:
I think the carbohydrate and protein can be found in living things
Answer:
I think the insertion is represented
Explanation:
hope this helps if not let me know have a blessed day
B. By using specific examples of inferences that could be made using two laws of stratigraphy
Answer: Option D.
The lub heart sound is due to the closing of atrioventricular valves.
Explanation:
Heart sounds are noises that are generated from beatings from heart and from blood that flows through it. The heart sound reflect the turbulence generated when the heart valves snap shut. Lub is the first heart sound also called S1 and it is caused by turbulence and closure of the atrioventricular valves(mitral and triscupid valves) at the start of systole. The second sound is the dub sound which caused by the closing of aortic and pulmonic valves at the end of systole.
