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

Biology & Microbiology

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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

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Most of the nutrient digestion and absorption takes place in the ____

a. stomach b. duodenum c. jejunum d. ileum e. large intestines

Biology & Microbiology

Trees allocate most of their tissue mass to supportive and conductive tissues in the trunk

Indicate whether the statement is true or false

Biology & Microbiology

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

Biology & Microbiology