What is the average amount of trash produced per person per day in the United States?
a. 1.4 pounds
b. 3.3 pounds
c. 6.8 pounds
d. 4.6 pounds
e. 2.1 pounds
d
Biology & Microbiology
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There are about __________ identified species of vertebrates
a. 2,000 b. 5,000 c. 30,000 d. 50,000 e. 125,000
Biology & Microbiology
The lumen of every blood vessel is lined by a monolayer of what cell type?
A) endothelial cells B) smooth muscle cells C) erythrocytes D) fibroblasts E) platelets
Biology & Microbiology
Briefly discuss physiological mechanisms that regulate body temperature in endotherms. What will be an ideal response?
Biology & Microbiology
_______ are characterized by having different types of teeth to feed on different types of food.
a) fishes b) birds c) amphibians d) reptiles e) mammals
Biology & Microbiology