Which of the following makes up most of an old tree trunk?
A) Secondary phloem
B) Primary phloem
C) Vascular cambium
D) Primary xylem
E) Secondary xylem
E
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Male peacocks have tail feathers that make up about 60% of their body length. During the mating season they shake these feathers in front of females
Longer feathers produce a larger volume of rustling sound for a given shaking rate, but they are also heavier, and thus require more energy to shake at a given rate than shorter feathers. This suggests that ______________. A. selective pressures will continue selection for longer and longer peacock tails B. selective pressures will always result in shorter peacock tails to reduce the energetic cost of shaking C. there are selective pressures against too long or too short of a tail, which results in the variable tail lengths D. tail length is completely random because there are selective pressures both for and against longer tails
In a Punnett square, the letters on top of the
square and on the side of the square represent
a. offspring genotypes. b. parental genotypes. c. parental gametes. d. offspring phenotypes. e. parental phenotypes
AIDS stands for ____
a. Acquired Immune Deficiency Syndrome b. Accelerated Immune Death Syndrome c. Accentuated Induced Deficiency Syndrome d. Advantageous Immunity Deficiency Syndrome e. Acquired Immuno Defense Syndrome
Motility is the only digestive task of the
a. mouth. b. esophagus. c. stomach. d. duodenum. e. jejunum.