What percentage of all living and fossil animals are invertebrates?
a. 10%
b. 50%
c. 70%
d. 80%
e. 90%
e
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Megacities are urban areas with more than ________ million inhabitants
A) 1 B) 10 C) 5 D) 20 E) 100
The concentrations of dissolved solids in seawater is known as salinity
Indicate whether the statement is true or false
What is the power rating of a light bulb when 0.8 A flow through it when connected to a 120-V outlet?
A) 12 W B) 15 W C) 60 W D) 96 W E) 120 W
A beam of protons and a beam of neutrons of the same energy are both harmful to living tissue. The beam of neutrons, however, is less harmful. Why?
A) Neutrons are much smaller and lighter than protons and would do less damage. B) Neutrons travel at reduced speed compared to the speed at which protons travel. C) Neutrons carry no electric charge and thus have a greater likelihood of passing through the tissue. D) All of the above are reasons why neutrons are less harmful.