Veins may look like white stripes cutting across a body of rock.

a. true
b. false


Answer: a. true

Environmental & Atmospheric Sciences

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A complex network of glands that release tiny amounts of hormones into the bloodstream of humans and other vertebrates is collectively known as the ____ system.

A. digestive  B. endocrine  C. excretory  D. circulatory  E. immune 

Environmental & Atmospheric Sciences

Nitrogen dioxide (NO2) reacts with ____ in the atmosphere to form nitric acid (HNO3)

a. hydrogen b. water vapor c. ozone d. carbon dioxide e. sulfur dioxide

Environmental & Atmospheric Sciences

Alley cropping, agroforestry and terracing are all methods of reducing ____________________

Fill in the blanks with correct word

Environmental & Atmospheric Sciences

_______ as a population less than ten percent of its previous levels

Fill in the blank(s) with correct word

Environmental & Atmospheric Sciences