The first land plants were restricted to moist, marshy environments because of
A) reproductive cell requirements.
B) the need for stem support.
C) the need for nutrients.
D) sensitivity to sunlight.
E) the lack of a cuticle.
A
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The evolutionary conversion of a structure, gene, or gene complex from one function to another was called ________ by Stephen Jay Gould and Elisabeth Vrba
Fill in the blank(s) with correct word
During exhalation, the pressure inside the lungs
A) initially is higher than atmospheric pressure, but drops as air leaves the body. B) must be maintained higher than atmospheric pressure. C) must be maintained lower than atmospheric pressure. D) gradually elevates as air enters the lungs. E) rapidly elevates.
Why is He positioned above Ne in the periodic table?
A. They both have the same atomic number. B. They both have a full outermost orbital. C. They both have the same number of protons in their nuclei. D. They both have the same atomic mass. E. They both have the same number of electrons in their outermost orbital.
The most abundant antibody class in the body, found in all body fluids, is
A) IgA. B) IgD. C) IgE. D) IgG. E) IgM.