Number 3
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<span>The stage at which all the cells show crossover chromosomes is meiotic prophase I. The crossover is the exchange of genetic material between homologous chromosomes. Homologous chromosomes are present in the meiosis I. Regarding the phase of meiosis I, it is expected that the crossover takes place in meiotic prophase I since homologous chromosomes pair up in the prophase.</span>
The Krebs cycle occurs in the <span>matrix of mitochondria. It is one of the main processes of creating energy for the organism.</span>
Power of attorney is capable act on behalf of someone when a decision can not be made
Molecules with similar shapes have similar biological effects, because shape (structure) dictates effects (functions).
