Answer: D
explanation: it’s proven that photosynthesis creates the energy for the plant and cellular respiration utilizes it.
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There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA.
Concentration gradient across the membrane. Proteins in the membrane allow specific molecules through, passively.
Rough ER is studded with ribosomes and the Smooth ER has a smooth surface ..
The evolution of molecular biology has made possible to establish a new classification of all organisms according to their DNA, and it's called phylogenetic classification.This classification groups living beings according to their kinship, established according to anatomical, physiological and behavioral criteria and especially genetic, based on the similarity of genes between species.
This made it possible to discover kinship ties between species of which there is no suspicion of any morphological link between them, something which the old classification (the traditional classification) was incapable of doing (and this proves the importance of the DNA and genes in organisms classification.
