Eukaryotes are organisms whose cells have a nucleus enclosed within a nuclear envelope.
The answer is d) organic chemistry
<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 rough endoplasmic reticulum (versus the smooth), which is where the ribosomes are and make proteins.
