Which observational tool astronomers arno penzias and robert wilson discover the existence of the cosmic microwave background (cmb)?

In 1964, while experimenting with the Holmdel Horn Antenna, which was used as a radio telescope, Penzias and Wilson accidentally discovered the microwave background radiation that exists universally. The Holmdel Horn Antenna was used to support the "Big Bang Theory" as opposed to the "Steady State Theory".

A multi-cellular organism is not an exact copy of its parents because the offspring shares genes of both the parents.

Explanation:

For a multi-cellular organism to reproduce, they require two parents.Characteristics are inherited from both the parents. So, an offspring can't b an exact copy of either of its parents.When a unicellular organism reproduce, they make an exact copy of its parent as they originate from only one parent.Punnett diagram is used to determine what all traits as organism is supposed to inherit from its parents.Chromosomes carry the blueprint of life from one generation to another.There are 46 chromosomes with 23 inherited from each parents through the process of mitosis. These chromosome makes up 23 pairs all together.