Which two groups of amniotes shows the closest relatedness?
a. Birds and turtles
b. Birds and crocodilians
c. Mammals and snakes
d. Crocodilians and lizards
e. Mammals and birds
b
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Bioassays can be used to
(a) test new drugs. (b) determine the effectiveness of new fertilizers and herbicides. (c) measure the effects their waste discharges have on aquatic organisms. (d) do all of these choice
When is a glucose molecule produced by the Calvin cycle?
a. after three turns, during the Fixation stage b. after six turns, during the Regeneration stage c. after six turns, during the Reduction stage d. after eight turns, during the Fixation stage
Eutrophication is primarily a result of (agricultural/industrial/urban) runoff.
Fill in the blank(s) with the appropriate word(s).
The early Earth's atmosphere was not the same as it is today.
Answer the following statement true (T) or false (F)