What is chrosome ? (Definition in own words )

A structure found inside the nucleus of a cell. A chromosome is made up of proteins and DNA

Explanation:

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a chromosome is a long DNA molecule with part or all of the genetic material of an organism. most eukaryotic chromosomes include packaging proteins called histones which aided by chaperone proteins bind to and condense the DNA molecule to maintain its integrity.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.