An organism’s habitat __________
a. is unchanging
b. includes both living and nonliving components
c. provides essential resources
d. includes both living and nonliving components and provides essential resources
D
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At what week of development does the offspring begin to be called a fetus?
a. Week 16 b. Week 8 c. Week 2 d. Week 4 e. Week 32
Which of the following statements regarding vaginosis and vaginitis is correct?
A. Both conditions result in a vaginal discharge with itching. B. Both conditions can be prevented with vaccinations. C. Vaginitis can complicate to pelvic inflammatory disease (PID), but vaginosis cannot. D. Vaginitis may be caused by fungi or protozoans, whereas vaginosis is invariably a viral infection.
Which of the following is referred to as a hollow ball of cells?
a. cleavage b. egg c. gastrula d. zygote e. blastula
Down syndrome in humans is due to
A. two Y chromosomes. B. trisomy (three copies of chromosome 21). C. three X chromosomes. D. monosomy (one copy of chromosome 21).