Answer:
Unlike typical mammalian red blood cells, those from amphibians, such as frogs, contain a DNA-bearing nucleus that is visible in the center of the cell. The circulatory system of amphibians is rather unusual, their hearts having three chambers, two atria, and a single ventricle.
NegativePositive
Positive
The design of the amphibian circulatory system is curious because blood accumulates oxygen in the lungs and is then returned to the heart before being pumped into the rest of the circulatory system. Therefore, a mixing between oxygenated and deoxygenated blood occurs as blood returning to the heart from the lungs is mixed with incoming blood from the body. Frogs handle this situation by having a very slow metabolism and by absorbing some oxygen through their skin. In addition, the ventricle does have some directional control over the distribution of the blood.
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The presence of a nucleus in amphibian red blood cells allows researchers easy access to large quantities of amphibian DNA. Frog blood has both a solid and a liquid portion. The liquid plasma carries solid elements such as red and white blood cells. Blood can be collected from frogs and the red blood cells isolated by centrifugation. After removal of the residual plasma, purified cells can be treated with specific enzymes and detergents to digest the cellular envelope and release DNA from its protein complex. The DNA is then useful for scientific studies and experiments.
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Explanation:
Answer:
northwest
Explanation:
the largest plate, the Pacific Plate is moving north west relative to the plate that holds North America. i also did this recently<3
The answer is option A)cyclins
The first was that all organisms have descended with modification from common ancestors.
The second was that the major agent of modification is natural selection acting on variation between individuals.
Answer:
According to the population growth graph, what can be determined about the population is that the carry capacity is around 0.4 million.
Explanation:
The graph shows the growth curve of a rabbit population, which is increasing progressively over the years until it flattens out in 2002, which is surely related to the carrying capacity of this population, established at around 0.4 million rabbits.
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Carrying capacity is the maximum number of inhabitants that can be in a given place according to the space and resources available</u>. The population can increase as long as they have the necessary space and resources to support a certain number of inhabitants. When the population exceeds its carrying capacity, it experiences a decrease in growth.
<em>In the graph, the growth of the rabbit population decreased when it reached a number of inhabitants of 0.4 million.</em>
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Carrying capacity brainly.com/question/1082066
