Answer:
Molluscans are very diverse animals and form an important part of the ecosystem in the world. Snails, octopuses, squids, oysters, clams etc. all belong to Phylum Mollusca.
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Answer:There are 21 species of cockatoo in the world
Explanation:
During DNA replication, DNA helicase enzymes move in a range of 
along the DNA.
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What are the benefits of DNA helicase?</h3>
Helicase enzymes are found in all living organisms, from bacteria to humans. They are required for replication and repair of DNA.
Helicases are enzymes that can unwind double-stranded DNA. They are found in all living cells and they play a key role in gene expression, replication and repair.
Helicases are also used for other purposes such as the production of recombinant proteins and the isolation of DNA from cells.
The helicase enzymes have many benefits for humans. For instance, they can break down the DNA from a cell to extract information about it. They also enable us to duplicate our genes so that they are preserved during cell division.
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Answer:
d. Meiosis II in the father
Explanation:
Since the son has two extra Y chromosomes, the nondisjunction would have occurred in father because females do not have Y chromosome. Before Meiosis DNA replication occurs during which the homologous chromosomes are replicated. During Meiosis I crossing over occurs and homologous chromosomes separate from each other. During Meiosis II sister chromatids of a chromosome separate and move into individual daughter cells.
Here, during Meiosis II the sister chromatids of Y chromosome did not separate from each other (nondisjunction). They collectively moved to one daughter cell. As a result one daughter cell had two Y chromosomes and other daughter cell had none. When the daughter cell containing two Y chromosomes combined with the daughter cell containing one X chromosome from mother, XYY individual was born.
