<span>Three months after fertilization and development of a placenta around the developing fetus, the corpus luteum regresses and forms the corpus albicans.</span> Formed placenta takes over progesterone production (which was the role of corpus luteum) and the corpus luteum degrades into a corpus albicans. The corpus luteum is being broken down by macrophages, in a process called luteolysis. The remains of the corpus albicans may persist as a scar on the ovary.
It has been estimated that active tobacco smoking causes close to 90% of lung cancer cases and is the cause of 87% of lung cancer deaths.
The speed of sound wave is slower than electromagnetic wave.
Allele frequency:
Number of times an allele occurs in a gene pool compared with the number of alleles in that pool for the same gene
