Isn't that where you turn the DNA into RNA?
The answer is C) The death rate begins to fall, but the birth rates remain high for a time. No countries in the world are currently in Stage 1 or demographic transition. However, many are in stage 2, which is why many governments are concerned about overpopulation.
All choices correctly describes physical barriers. Physical barriers after composed of tight junctions wherein it is difficult for the bacteria and viruses to penetrate. Examples of these physical barriers are the skin and the mucous membranes and these work in conjunction with secretions like tears and mucus (as tears and mucus contain IgA, a special type of immunoglobulin that is secreted to fight harmful organisms).
Get the provisions you have, if any and get to the lowest part of your house, ie basement or ground floor, away from windows
An ectoderm gives rise to hair, skin, nails or hooves, and the lens of the eye.
Hope this helps :)