An untied inflated balloon flies because
a. the pressure is higher inside than outside the balloon.
b. the pressure is lower inside than outside the balloon.
c. air flows down its pressure gradient.
d. both a and c occur.
d
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In a freshwater pond, a green alga is likely to be
A) colonial. B) filamentous. C) unicellular. D) colonial, filamentous, multicellular, or unicellular.
A single cell in a smoker's lung has become cancerous. It doubles its DNA and divides much faster
than a normal lung cell. The most likely change that would have caused this condition took place inthe:a. nucleus. b. nucleolus. c. microtubule. d. mitochondria. e. lysosome
Which example describes mechanical reproductive isolation?
A) Two squirrel populations live on either side of a mountain range. B) Two fly species have differently shaped genitals that prevent interspecies mating. C) Two similar species of sunflowers bloom at different times of the year. D) Individuals from two wildcat species produce infertile offspring when they mate.
How does breathing at a very low rate affect the reaction H+ + HCO3- ? H2CO3 ? H2O + CO2?
A. It pushes it to the left. B. It increases the rate at which it occurs. C. It decreases the rate at which it occurs. D. It pushes it to the right. E. It does not affect it.