Answer:
DNA or RNA
Explanation:
<em>Nucleotides are typically made up of phosphate group, nitrogenous bases and pentose sugars. They represent the building blocks of nucleic acids.</em>
<em>The nitogenous bases are of two types - purine and pyrimidine. Purine consists of adenine and guanine while pyrimidine consists of cytosine and thymine/uracil. </em>
<em>Both DNA and RNA consist of cytosine, adenine and guanine. However, thymine is only present in DNA and replaced by uracil in RNA.</em>
Hence, the cytosine could have come from either of DNA or RNA.
Answer:
The population of peppered moths thrived, because they camouflaged with the bark of the trees, thereby they were not easily seen by predators. Black moths were easily seen by predators and they were eaten as a result. Because the black moths did not survive, they were unable to reproduce offspring with those traits. However, peppered moths were able to reproduce offspring that were also peppered. During the industrial revolution, the colour of the bark darkened. This meant the peppered moths were easily seen by predators, so they were eaten. Black moths camouflaged with the bark, so now they weren't easily seen by predators. Now that the black moths survived, they could reproduce more black moths. But peppered moths weren't able to reproduce more peppered moths because most didn't survive. This is an example of how an abiotic factor, such as bark can affect a population of a species. Because the bark influenced the survival of the moths, some moths with the desirable traits survived, and others with the undesirable traits died.
Explanation:
CARBOHYDRATE HELPS TO IDENTIFY CELL TYPES.
Carbohydrates, proteins and lipids are all present inside the cell. Carbohydrates are usually attached to the cell proteins and lipids in order to enhance their functionality. These attached carbohydrates are typically used to identify cells.
External fertilization is the correct answer.
<span>The Phylogenetic trees are also commonly referred to as the Evolutionary Tree. This tree shows the inferred relationship between a certain set of organisms or group of organisms which are called as taxa. The tip of the branch represent the taxa and the node of the branch is for the ancestor. </span>
