In the cells of many eukaryotic species, the nuclear envelope has to disappear to permit which of the following events in the cell cycle? a) dna synthesis b) attachment of microtubules to kinetochores c) separation of the centrosomes d) condensation of the chromosomes

The cells of many eukaryotic species, the nuclear envelope has to disappear to permit the ''attachment of microtubules to the kinetochore''

Option B

Explanation:

One of the most important and ideal Hallmark of cell division is the ''mitosis'' and ''meiosis'' , both of which requires the attachment of the microtubules of the cell to the kinetochore of the chromosome. These microtubules pull the chromosomes to the opposite poles thereby facilitating the splitting of the parent cells into 2 daughter cells.

a

explanation:

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.