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

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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