Answer:
a. DNA ligase
Explanation:
DNA ligase is the enzyme of DNA replication that joins DNA segments together by catalyzing the formation of new phosphodiester bonds. These reactions use the energy of ATP molecules to form the bonds. The function of the DNA ligase enzyme is to join the Okazaki fragments together which in turn are formed during replication of the lagging strand. In the absence of DNA ligase, the Okazaki fragments cannot be joined together.
According to the given information, the process of DNA replication obtained shorts DNA segments of a few hundred nucleotides. This means that the reaction mixture lacked the DNA ligase enzyme and the DNA segments could not be joined together.
Correct answer: Genetic Drift
Genetic drift is defined as the random change in the allele frequency of a population is changed by chance or due to random changes in the environment. It is a random process that can lead to large changes in the overall population in a short period of time. It is a mechanism of evolution and it does produce the adaptation.
Hence, the correct answer would be genetic drift.
Answer:
Genetic Drift
Explanation:
Genetic drift refers to the evolutionary agent that brings about the changes in the gene pool of the population by some chance event. In the given example, half of the polar bear population was wiped out of the habitat by any chance event such as natural calamity, epidemic disease or any other random events. Since no mutation or natural selection was responsible for the death of polar bears, it is an example of genetic drift.
Genetic drift is more effective in small populations. And the size of the population of the polar bear was also small to allow the genetic drift to cause the changes.
tissues
organs
prokaryotic
Tributaries combine, adding water to rivers.
Ice sheets melt slowly, adding water to rivers.
Rainfall in an area increases, adding water to rivers.
How do rivers become larger as they travel across land?
Tributaries combine, adding water to rivers.
A tributary is a stream that flows into a larger river. Small streams from around an area combine together to form a bigger tributary that eventually falls into rivers. This adds water to the main river, finally leading this river water out into an ocean.
Answer:
Tributaries combine, adding water to rivers.
hope this helps you
Answer:
Marine biology is the study of organisms that lives in the marine environment, the environment that found in sea and oceans. They also study the interaction between these organisms and their environment.
Marine biologists study both living and non-living things in their surroundings where they do research. The living things they study are marine organisms like fishes, sharks, whales, crustaceans, deep-sea organisms, sea plants, microbes and many more living creatures present in the marine environment.
They study their behavior, feeding habits, interaction with other organisms, their role in the ecosystem, mating behavior, etc.
The non-living things a marine biologist study are physical and chemical environment of marine habitat, geology of the area, concentration of salt, and other molecules that affect marine biology.