Greetings!
The answer would be A. True.
Dissolved Oxygen is vital for most under water species. There has to be some flow of Oxygen throughout the water for the fish.
That is why most fish that are kept in tanks need filters. The purpose of the filter is to get that oxygen flow throughout the water, and of course keep it clean. Some fish, however will come to the top of the tank to breathe (Beta's for instance). But most fish will need that Oxygen throughout the water.
Hope this helps!
Answer: C. A natural disaster, such as a hurricane, struck the island.
A limiting factor is a resource or ecological condition because of which growth and distribution of an organism or group of organisms living in an ecosystem limits. A limiting factor can be of either physical or biological in nature. A limiting factor restricts organisms from occupying their fundamental niche. Examples of limiting factor are resources, stress due to overcrowding, disease or parasite and a natural disaster. According to the condition mentioned natural hazard can be the only limiting factor to limit the population at such considerable rate. Natural disaster is a physical limiting factor which has catastrophic impact of populations of different species living in an ecosystem. It has the potential to wipe out several inhabitants in one drastic event. Therefore, a natural disaster, such as a hurricane, struck the island can be a most likely explanation for the changes that the scientists observed.
Answer:
The correct answer will be- the cell structures undergo repeated breakdown and formation.
Explanation:
The carbohydrates, fatty acids and amino acids are the three important bio-molecules which form the components of various cellular structures.
In the given question, the cell biologist radiolabeled these biomolecules and then observed the cellular structures after cell metabolism. He found that few cellular structures contained radiolabeled structures and few not. This showed that the cellular structures constantly undergo changes in their structures due to cellular metabolic reactions and are broken down and reformed.
Thus, the cell structures undergo repeated breakdown and formation is the correct answer.
The correct answer would be the nucleus.
Hope this helped :)
