How does the use of a scanning electron microscope differ from that of transmission electron microscopes

A TEM makes images of the shadows that electrons make when they pass through the object of interest. They are absorbed to various degrees, which makes shadows of varying degrees of density.

An SEM makes images of the shadows that electrons make when they scatter from the surface of the object of interest.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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