The correct answer is - A. coal.
The coal is classified as organic sedimentary rock because the basis for its formation is the organic matter. It is a rock that is formed on the basis of dead organic matter from the Carboniferous, mostly of trees that existed in this period. Over a long period of time, tens and hundreds millions of years, the coal, under all the temperature and pressure that had influenced it started to take the shape in which we now know it. It can be mixed with other material, but in general comes in the non-mixed organic based form.
Answer:
the olfactory epithelium
Explanation:
There are several protective features of the respiratory system which is responsible for stopping the less aggressive pathogens. Some of these protective features are:
Hairs in nose which trap pathogens like bacteria, virus from entering the lungs. The respiratory tract has mucus which is responsible for trapping the microbes and mucus have IgA antibodies which helps in eliminating these microbes. Alveolar macrophages engulf the pathogen and digest them
Olfactory is not a protective feature of the respiratory system and is responsible and adapted to detect the odor and transfer this signal to the brain.
The answer is there (3). This is because a mitochondrion has it own DNA called mitochondrial DNA. Therefore the three genetic materials from different parents (mitochondria from donor mother, DNA from biological mother and DNA from biological father) would be present in the baby. Somatic nucleus transfer is the medical procedure used when the biological mother has mitochondria disorder which she would not wish to pass to her offsprings (which are inherited maternally).
The answer is A- sperm and egg. gametes are reproductive cells in mammals, so sperm and egg would be the correct.
