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A biopsychologist is studying the effects of anabolic steroids on the aggressive behavior of female rats. 24 female rats receive daily injections of a placebo (fake drug), while 24 others receive daily injections of the steroid. Round-the-clock videotapes of the communal cages of all rats allow all aggressive encounters to be counted and timed.  What is the INDEPENDENT variable in this experiment?

The basic unit of life is 

Choose the correct order of classification from MOST inclusive to LEAST inclusive.

Which of the following domains contain the most primitive prokaryotes that live in extreme environments?  

Which of the following is not a characteristic of ALL living things?

Which of the following best describes how the process of natural selection contributes to the development of antibiotic resistant bacteria?

Which definition best describes a population?  

In an experiment, a scientist measures the amount of algae growth in water with varying pH (acidic levels).  What is the DEPENDENT variable in this experiment?

Which of the following best explains a hypothesis?

Command Verbs:  select the correct command verb. saber ( Ud form) :