Which physician realized that doctors were causing maternal deaths by failing to wash their hands while assisting during childbirth?
A) Girolamo Fracastoro
B) Joseph Lister
C) Louis Pasteur
D) Ignaz Semmelweis
Ans: D) Ignaz Semmelweis
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During the end-Permian mass extinction:
A. oxygen levels in the deep oceans dropped. B. global warming occurred as a result of volcanic eruptions. C. oceans were acidified as a result of volcanic eruptions. D. oxygen levels in the deep oceans dropped and oceans were acidified as a result of volcanic eruptions. E. all of the answer options are correct.
A collection of birth defects caused by alcohol consumption during pregnancy is known as ____________________. Fill in the blank(s) with the appropriate word(s)
Fossil evidence places the origin of angiosperms in the early Cretaceous period, at least 130 million years ago. By 100 million years ago, all of today's major lineages of angiosperms had evolved. Angiosperms make up 95% of all modern plants species. Which of the following may help explain the rapid success of angiosperms?
A. use of the wind to disperse pollen and seeds B. use of flowers and fruits to protect and disperse both pollen and seeds C. use of the wind to disperse spores D. use of water to disperse pollen and seeds E. All answers are correct.
In mitosis, cells duplicate their chromosomes once and divide once. In meiosis, cells duplicate their chromosomes ________ and divide ________
A) twice; once B) once; once C) twice; twice D) once; twice