Which statement best explains why embryos with a missing autosome are not found among spontaneously aborted fetuses?
A. These embryos occur less often than
those with an extra autosome.
B. Fertilization does not occur under these
circumstances.
C. Pregnancy is not recognized because an
abortion occurs shortly after fertilization.
D. These embryos do not get aborted but
continue to live birth.
E. None of the statements are correct.
C
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Which statement is true?
a. Roots are well preserved in the fossil record. b. Bryophyte rhizoids are larger and stronger than roots. c. Vascular tissue appears to predate roots in plants. d. The primary purpose of roots is water storage.
Which cells make you immune to a disease to which you were previously exposed?
1.effector cells 2.memory cells 3.dendritic cells 4.phagocytes 5.fibroblasts
Which structure of the male reproductive system is also part of the urinary system?
A. testes B. urethra C. bulbourethral gland D. vas deferens E. prostate gland
One of the first naturalists to systematically study marine organisms was
a. Darwin b. Forbes c. Agassiz d. Aristotle e. Pliny