What are the sources of sulfur in the atmosphere?
A) Mostly (over 90%) volcanoes and photosynthetic bacteria
B) Mostly transportation modes, such as autos, trucks, and planes
C) Volcanoes and hot springs, but mostly (about 75%) human activities such as burning coal
D) Decomposition and small amounts from pollution
E) Natural and human sources, in equal amounts
C
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The structure labeled "C" is the ____
a. trunk of the pulmonary arteries b. left atrium c. left ventricle d. right atrium e. right ventricle
With the same situation as the previous question, what would the resulting F2 plants be?
What will be an ideal response?
Plants have evolved all of the following methods to help them conserve water except
A. a waxy cuticle. B. stomata. C. mycorrhizae. D. spores.
Neurulation begins in the ____ region and moves in the ____ direction(s).
A. Cranial; Rostral B. Cervical; Medial & Lateral C. Cervical; Rostral & Caudal D. Thoracic; Rostral & Caudal E. Lumbar; Medial & Lateral