Increase in the population of photosynthetic
bacteria using the oxygen-releasing pathway
led to an increase in the oxygen levels in the
seas and air. What was (were) the major
consequence(s) of that change?
I. aerobic respiration became the major
mode of life
II. all anaerobic organisms went extinct
III. formation of ozone layer
a. I only
b. II only
c. I and II
d. I and III
e. I, II, and III
D
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Experiments are carried out to test a hypothesis by changing one variable at a time and including an unchanged variable termed a(n) _____.
A. experimental variable B. altered variable C. control D. stable variable
Which of the letters in the above figure
represents the anther? a. A b. B c. C d. D e. none of these
The ability of the brain to assign meaning to a stimulus is called:a
adaptation. b. integration. c. processing. d. perception. e. assembly.
________ are microscopic prokaryotes inhabiting, among other hostile places, hot springs and very salty waters
Fill in the blank(s) with correct word