A waxy cuticle helps land plants ______________
a. conserve water c. reproduce
b. take up carbon dioxide d. stand upright
A
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________ are various types of intracellular structures thought to have evolved within a cell rather than as organelles
a. Endosymbionts b. Ribosomes c. Lysosomes d. Mitochondria
Zircon crystals that form in molten magma are easily dated because they initially contain ____
a. no lead b. no uranium c. uranium but no lead d. lead but no uranium e. both lead and uranium
Based on the graph, how soon could another action potential be easily initiated (at the end of the relative refractory period) after the first stimulus?
A) less than 0.5 msec B) 1 msec C) 2 msec D) 3 msec E) 4 msec
A fruit fly, internally infected by a potentially pathogenic fungus, is protected by its _____
A) immunoglobulins B) antibodies C) antimicrobial peptides D) B cells