In the five-kingdom classification system broadly accepted in the 1960s, how many kingdoms included prokaryotes?
a. zero
b. one
c. two
d. three
e. four
Answer: b. one
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As we study the past 50,000 years worth of information about species' decline and extinctions around the world
A. we see rapid extinctions, especially of the larger animals, not long after humans arrive in an area. B. we can make a rough estimate of a population's risk of a local extinction. C. we see a steady-state rate of extinctions on all continents, only islands show a difference due to climate change. D. we see huge extinctions, especially of the larger animals, with ice ages and global warming. E. we see local extinctions that appear random, and then recolonizations from other areas.
During the follicular phase of the menstrual cycle, a number of events occur which are listed below. Select the answer that places the events in the correct chronological order
Events: 1. the lining of the uterus thickens 2. granulosa cells secrete estradiol 3. FSH acts on granulosa cells 4. LH levels surge rapidly then decline 5. ovulation occurs A. 3, 2, 1, 4, 5 B. 3, 1, 2, 4, 5 C. 1, 2, 3, 4, 5 D. 2, 4, 3, 1, 5 E. 4, 3, 2, 1, 5
Most radiolaria have an internal skeleton made of ________.
A. microtubules B. cellulose C. glycoproteins D. siliceous material
You are conducting an experiment to determine what concentration of disinfectant is most effective in killing bacteria. In this example, the concentration of disinfectant would represent the
(a). control. (b). experimental variable. (c). response variable. (d). data. (e). hypothesis.