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