LIFE SCIENCE

Detailed explanation-1: -embryology, the study of the formation and development of an embryo and fetus. Before widespread use of the microscope and the advent of cellular biology in the 19th century, embryology was based on descriptive and comparative studies.

Detailed explanation-2: -Important events that occur during the first week of human embryonic development include gamete approximation, contact and fusion of gametes, fertilization, mitotic cleavage of the blastomere, morula formation, blastocyst formation, and implantation of the blastocyst.

Detailed explanation-3: -Embryology is the branch of biology that investigates the formation of gametes (sex cells) before fertilization, as well as the fertilization and development of embryos and fetuses, and organisms.

Detailed explanation-4: -Human Embryology and Developmental Biology is the study of the fascinating process in humans and animals that turns a single fertilised egg into a whole new individual with all the many specialised cell types.