Answer:
Which of the following best describes veins? a. thick walled, small lumens, low pressure, lack valves b. thin walled, large lumens, low pressure, have valves c. thin walled, small lumens, high pressure, have valves d. thick walled, large lumens, high pressure, lack valves
Explanation: yw have a good day
Microscope. You’d need the ability to magnify it to be able to see it
Answer:
C: blue
Explanation:
The surface temperature of a star determines the color of light it emits," according to the worldwide Las Cumbres Observatory. "Blue stars are hotter than yellow stars, which are hotter than red stars."
Answer:
Option-A
Explanation:
Meselson and Stahl are known for their experiment which proved that DNA replicates by semiconservative mode of replication.
They selected the E.coli bacteria and grew them in the heavy isotope of Nitrogen that is N¹⁵ and later into the N¹⁴ isotope. Since nitrogen is the constituent of the DNA, therefore, is incorporated into the DNA.
They used the CsCl density centrifugation technique and observed the bands according to the density of nitrogen and reached the conclusion after the third generation that DNA replicates by semiconservative mode.
Thus, Option-A is correct.