The variation among individuals, on which natural selection acts, describes
A) nutritional differences.
B) random occurrences in the lifetimes of individuals.
C) genetic differences.
D) physical training and exercise.
C
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Approximately what percentage of the species that have ever existed on Earth are represented by the estimated 10 million species that exist today?
A) 80% B) 10% C) 1% D) 0.0001%
Which one of the following is TRUE regarding the flow of energy through an ecosystem?
A) Energy flows from the sun to consumers and then to producers. B) Energy flows in multiple directions through an ecosystem. C) Energy is cycled through an ecosystem and rarely lost as heat. D) Energy flows from the sun to producers and then to consumers. E) As energy flows through an ecosystem, it does not change form.
The __________ circuit carries blood from the heart to body tissues, and then returns it to the heart.
Fill in the blank(s) with the appropriate word(s).
Which component of the influenza virus is required for the initial attachment to human respiratory epithelial cells?
a. capsid protein b. hemagglutinin c. phospholipid d. matrix protein