The rate of mitotic division that takes place between the 4-cells stage and the morula, is 12 hours per cell division. The first division occurs in about a day after fertilization, and subsequent divisions occur every 12 to 24 hours after that. The zygote divides several times to form a mass of cells called morula, which is an embryonic stage consisting of a solid, compact mass of 16 or more cells.
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Answer:
The term mechanical digestion refers to the physical breakdown of large pieces of food into smaller pieces which can be done by digestive enzymes, hydrochloric acid. Mechanical digestion in the stomach results in the formation of bolus.
Explanation:
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