Hello Peppa Pig,
I'd say that the answer is B because you can observe how the perching birds make their nests.
Have a good day
Answer:
हिंदी में खोजें
मानव द्वारा उपयोग किए जाने वाले चार विभिन्न प्राथमिक ऊर्जा संसाधनों की सूची बनाएं
<em><u>Crude oil, coal, wind and natural gas are all primary energy sources. Electricity is not a primary energy source, it's an energy currency (see electricity as an energy currency for an in depth discussion). Likewise, secondary fuels are also energy currencies and aren't primary energy sources, they must be made.</u></em>
Answer:
Carbon
Explanation:
Carbon is found in all living organisms
Answer:
A. After one round of replication in radioactive solution, one double-stranded DNA molecule would be radioactive in both strands and the other would not be radioactive in either strand.
Explanation:
In 1960, Taylor showed that DNA replication in eukaryotic cells is semiconservative. During DNA replication, two DNA molecules are synthesized from the original template. Each one of these DNA molecules contains one strand of the original DNA molecule and one newly-synthesized strand. Taylor used for its experiment plant cells of <em>Vicia faba </em>replicated in the presence of 3H-thymidine. This radioactive isotope (3H-thymidine) releases beta-particles (electrons) and it was used to evidence the semiconservative mechanism by following the distribution of radioactive labeled DNA through a technique known as autoradiography.
