In aquatic plants, water passes among the tissues and provides the medium for gas exchange. In terrestrial plants, air enters the tissues, and the gases diffuse into the moisture bathing the internal cells.
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The correct answer of the given question above would be the third option: THE EVOLUTION OF POPULATIONS OVER TIME. What is represented by the base of a phylogenic tree is the evolution of populations over time. It is also known as the evolutionary tree. This tree shows the evolutionary relationships among species.
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nitrogen can be changed into macromolecules like proteins and nucleic acids (DNA and RNA)
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Organisms are classified into different groups in order to identify any specific organisms. ... Classification also helps us in understanding each individual organisms and their differences and similarities with other organisms helps us to understand the evolutionary process in a better way.
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