luteinizing hormone
Ovulation. Estrogen levels peak towards the end of the follicular phase. This causes a surge in levels of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This lasts from 24 to 36 hours, and results in the rupture of the ovarian follicles, causing the oocyte to be released from the ovary.
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2.5 million years ago the first genus Homo evolves.
Answer:
Cell, tissue, organ, organ system.
Explanation:
Cell is the structural and function unit of the living system. All living organisms are made of cell. Two main types of organisms are unicellular organism and multicellular organism.
Cell is the smallest unit. Cell will combine together and perform a unique function known as tissue. Similar tissue combine together to form a particular organs. Different organs combine together to form the organ system in the living organism.
Thus, the correct answer is option (b).
