Surface tension is the property of water which allows for some lightweight insects to walk on top of a pond and not fall in. The molecules of water are held together by cohesive forces. The molecules of water present below the surface experience this cohesive force from all the directions, whereas the water molecules present on the surface experience a downward pull, as the force is not balanced. This leads to the concaving of the water surface inside a small tube.
The answer is A: a flagship species.
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Selective logging—the practice of removing one or two trees and leaving the rest intact—is often considered a sustainable alternative to clear-cutting, in which a large swath of forest is cut down, leaving little behind except wood debris and a denuded landscape
<span>Kepler’s harmonic law is the
third law of the Planetary Motion. He discovered this after ten years that
there is a relation between the time of a planet’s orbit and its distance from
the sun. The harmonic law states that <u>the squares of the orbital periods of
the planets around the Sun are proportional to the cubes of the planet’s orbital
period</u>. <u> </u> </span>