C. Centromere.
Spindles make up fibers, chromosomes are apart of DNA, Centriole is in animal cells near the nucleus aids in the process of making spindle fibers in the cell division.
The test that the nurse will need to check is the OXYGEN SATURATION TEST.
In an healthy lungs, the oxygen saturation level ranges between 95 and 100%, this means that, when red blood cells pass through the lungs 95 to 100% of them is saturated with oxygen. When a lung disease is present, this percentage will be highly reduced. Thus, the oxygen saturation test gives an indication of how efficient the patient's breathing is
Genetic variation in a population allows for phenotypic variation, meaning that different traits exist in the same population. When the environment changes, the members of the population are tested by natural selection with regards to how well adapted their specific traits are to the new environment. If the traits they have do not suit their environment, this results in reduced survival and fitness, leading to less of that trait in the population. However, if the traits they have are adapted to the environment, they become naturally selected for with better survivability and fitness (leading to a higher frequency of that trait in the population). Thus, evolution has occurred.
The correct answer is option C
The main cause of extinction on earth today is the impact of human beings on environment. Previously, extinction caused due many reasons but now the main reason is the involvement of human beings in the environment.
The human activities like deforestation, construction and many more activities adversely effects the population of most of the species.
They first become endangered and then readily if not protected on time becomes extincted.
