The structure that separates the thoracic and abdominal cavities is the: MCQ with Answer and Explanation

Explanation:
DNA sequencing determines the precise order of nucleotides in a DNA fragment. Sanger's dideoxy chain-termination method and next-generation sequencing are common. PCR amplifies DNA, gel electrophoresis separates by size, Southern blotting detects specific sequences. Sequencing is fundamental in genomics.

Explanation:
Antonie van Leeuwenhoek (1670s) constructed high-quality single-lens microscopes and was the first to observe bacteria, protozoa, sperm cells, and red blood cells, describing them as 'animalcules'. Hooke observed cells in cork. Pasteur disproved spontaneous generation, Lister introduced antiseptic surgery. Leeuwenhoek's pioneering work laid the foundation for microbiology.

Explanation:
The chorion is the outermost membrane surrounding the embryo. It forms chorionic villi that interdigitate with maternal uterine tissue to form the placenta, facilitating nutrient and gas exchange. The amnion surrounds the embryo, forming a fluid-filled cavity. The yolk sac is involved in early nutrition, allantois forms part of the umbilical cord. The chorion is derived from trophoblast and extraembryonic mesoderm.