The _____ consists of three layers: the endometrium, the myometrium, and the perimetrium.

A. uterus
B. vagina
C. clitoris
D. ovaries


A. uterus

Biology & Microbiology

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In the reproductive cycle of a fern, a zygote develops into

a. sperm and egg. b. spores. c. a young gametophyte. d. a young sporophyte.

Biology & Microbiology

Gastrulation leads to the development of what?

a. three distinct germ layers b. two distinct germ layers c. one distinct germ layer d. polar bodies

Biology & Microbiology

Which of the following must occur for a malignant tumor to form?

1.proto-oncogene converted to oncogene 2.failure of tumor suppressor gene 3.both proto-oncogene converted to oncogene and failure of tumor suppressor gene 4.none of the choices

Biology & Microbiology

The cell's metabolic reactions involve the participation of ________ that lower the activation energy needed for the initiation of a reaction.

A. coenzymes B. enzymes C. cofactors D. ATP E. vitamins

Biology & Microbiology