Until recently, protists have been classified according to which of the following criteria?
a. modes of nutrition
b. mechanisms of movement
c. types of life cycle
d. modes of nutrition and mechanisms of movement
e. modes of nutrition, mechanisms of movement, and types of life cycle
E
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The frequency of a particular allele within a population can be changed, over time, by
A. genetic outflow. B. large population size. C. selection. D. inheritance of acquired characteristics. E. random mating.
Where does crossing over occur in meiosis?
a. prophase I b. metaphase I c. anaphase I d. telophase I
Which of the following describes the source water of a river?
a. cold and low in nutrients b. warm and high in nutrients c. murky and warm d. clear and warm
The male gametophyte of flowering plants is produced by cell divisions within the
A) sepal. B) carpel. C) anther. D) stigma. E) filament.