Immersion oil is used with some microscope lenses because it has the same __________ as glass.
Fill in the blank(s) with the appropriate word(s)
Answer: Refractive index
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During which stage of development are germ cell layers first formed?
A. fertilization B. cleavage C. neurulation D. gastrulation E. organogenesis
Which scientist(s) suggested for the first time
that the proportion of adenine and guanine differs from one species to another?
a. Watson and Crick b. Wilkins c. Hershey and Chase d. Chargaff e. Franklin
The mutualistic algae that live within the tissues of corals are called ________
Fill in the blank(s) with correct word
The first heart sound (lub) is produced by the closing of the __________ and __________ valves
a. aortic semilunar; pulmonary semilunar b. right atrioventricular; aortic semilunar c. left atrioventricular; pulmonary semilunar d. right atrioventricular; left atrioventricular e. mitral; left atrioventricular