Literary focus: rhythm and mood
the mood of a work is the —
select one:
a. way in which the writer uses language
b. author’s emotional state
c. attitude of the poet
d. atmosphere or dominant feeling

Which of the following explains why a tree is often used as a model to represent the principle of common descent

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.

Ruby is conducting an investigation. an advantage of her design is that she can use a large range of variables, with that she can not be sure that one variable is the cause of another. what kind of investigation is ruby most likely conducting?