While swimming, Frogs propell themselves, and their small legs act like a turbine, it sends water backward, so they get forward speed in reaction.
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<span>The type of scale that George would have used is called a Gravimeter. It is the measurement of the strength of a gravitational field</span>.
Answer:D
Explanation: The pulmonary air sacs of birds only permit a unidirectional flow of air through the lungs. Unidirectional flow means that air is inhale and exhale through one trachea alternatively. This means the bird lungs only receive largely fresh air which has a high oxygen content during inhalation and do not receive fresh during exhalation. While air flow bidirectional in mammals.
Answer: Over thousands of years, the water filled one basin and then spilled over into the next, like a series of bathtubs overflowing.
Explanation:
