What is meant by nucleas ​

a central part about which other parts are grouped or gathered; core:A few faithful friends formed the nucleus of the club.

Biology. a specialized, usually spherical mass of protoplasm encased in a double membrane, and found in most living eukaryotic cells, directing their growth, metabolism, and reproduction, and functioning in the transmission of genic characters.

Physics. the positively charged mass within an atom, composed of neutrons and protons, and possessing most of the mass but occupying only a small fraction of the volume of the atom.

Anatomy. a mass of nerve cells in the brain or spinal cord in which nerve fibers form connections.

Also called condensation nucleus. Meteorology. a particle upon which condensation of water vapor occurs to form water drops or ice crystals.

Chemistry. a fundamental arrangement of atoms, as the benzene ring, that may occur in many compounds by substitution of atoms without a change in structure.

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The nucleus is a membrane-bound organelle that contains genetic material (DNA) of eukaryotic organisms. As such, it serves to maintain the integrity of the cell by facilitating transcription and replication processes.

answer:

A nucleus is a membrane-bound organelle that contains the cell's chromosomes. Pores in the nuclear membrane allow for the passage of molecules in and out of the nucleus.

Explanation:

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Explanation:gravational force means force exerted by gravity

if you hold a bucket full of water then two forces will be acting on the bucket.one will be the atmospheric pressure and the other will be the force of gravity.this makes the bucket still until we dnt make it move

Frictional force means when two objects come in contact with each other,friction is produced.for ex. we are able to walk on the ground bcoz of friction.when we push the ground while walking,the force of friction+gravatational force also exerts force as a result we are able to walk