Prokaryotic Organisms Were the Only Life-Forms Present on Earth for Almost

question 19

True/False

Prokaryotic organisms were the only life-forms present on earth for almost 2 billion years.Multicellular eukaryotes have only been around for about 25% of earth's history

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Definitions:

Ovarian Cycle

The series of physiological changes that occur in the ovaries, typically on a monthly basis, involving follicle development, ovulation, and the formation of the corpus luteum.

Pregnancy

The period during which a fetus develops inside a woman's womb or uterus, usually lasting about 40 weeks from the last menstrual period to childbirth.

Embryo Implants

The process by which a fertilized embryo attaches itself to the wall of the uterus, beginning the stages of pregnancy.

Endometrium

The inner lining of the uterus, which thickens during the menstrual cycle in preparation for possible implantation of an embryo.