Answer:
Human impacts on marine ecosystems. Human activities affect marine ecosystems as a result of pollution, overfishing, the introduction of invasive species,and acidification, which all impact on the marine food web and may lead to largely unknown consequences for the biodiversity and survival of marine life forms.
I think B would be the correct answer
Density.
If the density is more than that of water than it sinks.
If it is less than it floats.
Density is the amount of mass in a certain space, therefore
D = M/V
Density = mass divided by volume
<span>a. so that a cell can grow.
Mitosis is responsible for this replication. During its phases the cell prepares various needed materials and procedures to do the process and then finally duplicate the DNA into the daughter cells.
</span><span>Semiconservative mechanism of DNA replication means that each daughter DNA strand contains one strand from the parent and one that is newly synthesized.</span>
Answer:
Down syndrome.
Explanation:
Down syndrome may be defined as the medical condition that occurs due to the presence of extra chromosome at the chromosome number 21. The individual has big head, rolled finger and tongue.
The chances of Down syndrome increases as the mother's age increases. The egg of the female get arrested at diplotene stage and with the increased age of mother the phenomena like translocation and non disjunction increases at this stage.
Thus, the correct answer is option (a).
