Photoreceptors<span>: The light sensing nerve cells (rods and cones) </span>located<span> in the retina. Pupil: The adjustable opening at the center of the iris through which light enters the</span>eye<span>. Retina: The light sensitive layer of tissue that lines the back of the </span>eye<span>.</span>
Answer:
The process which must occur when intending to work with research animals that are covered by the U.S federal regulations is ethical review and approval
Explanation:
Some animals had been threatened of extinction due to inconsiderate usage and killings due to either commercial, food, or research purpose. The U.S government, therefore, to prevent the extinction of such animals, formulated a law to restrict the engagement of these animals, even in research if the research will involve the slaughtering, injuring, or alter the physiological functions of the subject animals. Therefore, there has been needing to undergo a compulsory ethical review process when planning to undertake research. This process will objectively review the aims and objectives of the intended research, the methodology involved in achieving the aim, as stated in the research proposal. The importance of this review is to determine if the research will have deleterious effects on the animals, both spontaneously and in the future.
The main function of the nephron is to filter wastes out of the body and the re-absorption of substances required by the body.
The nephron also has components that have specific functions. There are about 1 million nephrons in one kidney
The nutrient that is responsible for causing most accidental deaths in children is iron.
The number of the chromosomes in each of its body cells from the number of chromosomes of its gametes would be 9. It is because the number of chromosomes in a gamete must be halved in order to achieve the number of chromosomes present in each body cell which is important for cell division.