Which factor is the main driving force behind the water cycle?
a. Ocean currents
b. Volcanic eruptions
c. Temperature
d. Sunlight
e. Land formations
d
Biology & Microbiology
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True or false: Biomes are strictly terrestrial systems
A. true B. false
Biology & Microbiology
Two-thirds of the available freshwater is
a. used as drinking water for animals. b. used as drinking water for humans. c. used for irrigation. d. wasted.
Biology & Microbiology
What serves as the cardiac pacemaker?
a. sinoatrial node b. atrioventricular node c. gap junction d. the left ventricle e. conducting fiber
Biology & Microbiology
Which of the following groups were first to
have an amniotic egg?
a. birds b. reptiles c. amphibians d. bony fishes e. mammals
Biology & Microbiology