Is a system in which both matter and energy flow into and out of the system. a closed system an isolated system an open system a dynamic system

Open system

Explanation:

There are three types of systems:

Open System: A system where mater and energy both can pass across the boundary. Example: Tea kept in a cup

Closed system: A system where mater can not be exchanged but energy can be exchanged. Example: Tea kept in a kettle

Isolated System: A system where neither mater nor energy both can be exchanged.  Example: Tea kept in a thermos

DNA condenses into chromosomes.

Explanation: Chromatin carefully packs these DNA molecules into stringy-looking structures called chromosomes. If the DNA molecules in cells were not snaked around histones, the molecules would be 6 feet long when placed end-to-end, according to the National Human Genome Research Institute.