<span>The number of protons plus the number of neutrons is called the mass number.</span>
I believe the answer is true. Humans have a digestive track, which removes unwanted matter from the body.
<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>
Here is the definition
<span>
an unborn or unhatched offspring in the process of development.</span>
