Which is not a requirement for natural selection to occur?
A) Random mating
B) Competition for limited resources
C) Variation in the offspring
D) Unequal reproductive success
Answer: A) Random mating
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Polypeptides can have which of the following types of effects?
I) autocrine II) paracrine III) endocrine A) only I and III B) only II and III C) only I and II D) I, II, and III
Mollusks are distinguished from other animal groups by the presence of (select all that apply)
A. a mantle that plays a role in breathing and excretion. B. a toothlike radula in some. C. a segmented body with a hydrostatic skeleton. D. ecdysis. E. none of these
Most of the nutrient digestion and absorption takes place in the ____
a. stomach b. duodenum c. jejunum d. ileum e. large intestines
Trees allocate most of their tissue mass to supportive and conductive tissues in the trunk
Indicate whether the statement is true or false