Correct answer: C). Thymine
The thymine, which is present in the DNA is replaced by the uracil in the RNA. Uracil is one of the four nitrogenous bases which are found in the RNA. The nitrogenous bases present in the RNA are adenine, guanine, uracil, and cytosine. While the nitrogenous bases found in DNA are Adenine, guanine, thymine, and cytosine.
Hence, thymine is the nitrogenous bases which are not found in RNA.
The Cenozioc era is referred to as the age of mammals.
Answer:
Observers ahead of the wave observe an apparent increase in wave frequency
Explanation:
This is the Doppler Effect. The frequency of a wave increases when the source approaches the observer and decreases as the source recedes.
B, C, and D are wrong. Observers behind the source notice a decrease in frequency.
Answer:
There is an increase in biodiversity due to the isolation that occurs and the adaptation that species must have to new habitat conditions. In the same way the species of each of the parts of the continent will be different from each other.