Fast and ____________________ muscle fibers contract rapidly but do not produce sustained contractions, whereas slow and ____________________ muscle fibers contract slowly but can produce energy for long periods of time via aerobic respiration

Fill in the blank(s) with correct word


white; red

Biology & Microbiology

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Which reservoir holds the largest volume of Earth’s water?

a. groundwater b. rivers c. lakes d. atmosphere e. polar ice

Biology & Microbiology

A scientist found an unweathered igneous rock that contained 0.025 g of potassium-40 and 0.075 g of argon-40. The half-life of potassium-40 is 1.3 billion years. Using the table from figure 22.8 the age of the rock would be estimated to be



A. 2.6 billion years old.
B. 0.050 billion years old.
C. 1.3 billion years old.
D. 0.001875 billion years old.
E. 1.69 billion years old.

Biology & Microbiology

PBDEs are ____

a. permitted in many European countries but banned in the United States b. permitted in only one European country and in only 11 states in the United States c. banned worldwide but are still being used illegally d. banned in many European countries but permitted in most states in the United States e. banned in many Europeans countries and all states in the United States

Biology & Microbiology

Genetic drift is associated with 

A. asexually reproducing populations. B. the size of the population. C. increased genetic diversity in a population. D. All of the choices are correct.

Biology & Microbiology