One group of fruit flies reproduces in August and one group reproduces in September. Which of the following
mechanisms is preventing them from cross breeding?
a. sexual isolation
b. diurnal isolation
c. gametic isolation
d. temporal isolation
e. mechanical isolation
d
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The typical osmolarity of body fluids in most marine invertebrates is
a. ~5 mOsm/L. b. ~225 mOsm/L. c. ~300 mOsm/L. d. ~1000 mOsm/L. e. ~1500 mOsm/L.
Which kind of ground tissue, A, B, or C, would be best described as soft tissue most responsible for storage or photosynthesis?
1.A
2.B
3.C
Which cells secrete surfactant?
A) alveolar macrophages B) goblet cells C) type II alveolar cells D) ciliated cells E) type I alveolar cells
The large diversity of biological molecules depends on the element ________. This element can make stable bonds to itself and to atoms of other elements. Without this element, the large macromolecules that make up most of the molecules in living organisms would not be possible.
A. carbon B. hydrogen C. nitrogen D. oxygen