Answer:
a greater volume of blood returning to the heart
Explanation:
Your heart rate goes up when your heart starts pumping faster.
Answer:
The correct answer is option B.
Explanation:
On seeing the question, it is clear that it is based upon the concept of semi-conservative theory for the replication of DNA. It is mentioned that when the bacteria were grown on N-15, the mass was 55 fg. Now, after two generations, the DNA would comprise N-14 and the mass of them will be 5.4 fg.
The average mass would be = 5.4 + 5.5 / 2 = 10.9 / 2 = 5.45 fg. The mass of the bacteria isolated from the culture would possibly contain both the masses. That is, the mass of DNA with N-14 only would be 5.4 fg, and the mass of DNA with both N-15 and N-14 would be the average, that is, 5.45 fg.
The correct option is C.
Homeostasis refers to the method by which living organisms regulate their internal environments. The conditions that surround the living cells has to be kept at the optimum level because the survival of the organism depend on it and this is what homeostasis does.
