Which zone in a lake is the shallowest part?
A. fundal
B. profundal
C. limnetic
D. littoral
Answer: D
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Sister chromatids of replicated chromosomes are separated during ________________
A. mitosis B. meiosis I and mitosis C. meiosis II and mitosis D. meiosis I E. meiosis II
Which of the following statements about the evolution of animal cell adhesion molecules is true?
A. Animal cell adhesion molecules evolved from protein families that originally performed other functions. B. The genes for integrins are found in all opisthokonts including animals, plants, and fungi. C. The genes for cadherins are only found in animals. D. The genes for integrins are found only in multicellular organisms. E. All of these statements about the evolution of animal cell adhesion molecules are true.
Sperm
a. are male gametes. b. are female gametes. c. contain yolk. d. are produced in the ovaries.
Menstruation occurs when there is a decrease in
A) levels of estrogen and progesterone. B) the number of follicles. C) levels of FSH and LH. D) endometrial thickness. E) the number of sperm present.