The correction option is A.
Reproductive isolation is divided into two major classes, which are prezygotic and postzygotic isolation. Prezygotic isolation refers to the barriers that are present before the egg can be fertilized while postzygotic isolation refers to those barriers that are present after the egg has been fertilized. Mechanical isolation is a type of prezygotic isolation. Mechanical isolation is a type of reproductive barrier which exist because the male and the female genitalia have different sizes, shapes and locations. The snails that coil to the left and those that coil to the right have the locations of their genitalia in different places.
The drug is: Niacin, or nicotinic acid (vitamin B3, ou PP) (do not confuse with nicotine)
Nicotinic acid, or niacin, is known for its normolipidemic properties since the 1950s. It was the subject of the first trial of cardiovascular prevention by intervention on the lipidic factor, the coronary drug project (CDP). Despite significant side effects, mainly flushing, it has since been used, mainly in the United States, as a treatment for mixed hyperlipidemias, thanks to its hypotriglyceridemic effect for the increase of HDL-cholesterol.
Answer:
The formula for calculating magnification is:
Magnification = Size of drawing / Actual size
Size of drawing = 40 mm
Actual size = 40 micron meter
Convert 40 mm to micron unit: 40 * 1000 = 40,000 micron
Magnification = 40,000 / 40 = 1000.
The magnification is 1000 X.
This answer means that the drawing is 1000 times bigger than the actual size of the cell.