If we are talking about methods of sexual reproduction, then:
when copulating, two unicellular individuals merge (the genetic information of both parents is combined, and then they are shared by meiosis (there is an increase in the number of individuals who received genetic information from both parents).
during conjugation, genetic information is exchanged without increasing the number of individuals. The following main forms of conjugation are distinguished: isogamy, anisogamy and oogamy.
With isogamy, mobile, morphologically identical gametes are formed. Isogamy is found in many algae.
With heterogamy, mobile, different morphologically and physiologically gametes are formed. This type of sexual process is characteristic of many algae.
In the case of oogamy, gametes are very different from each other. The female gamete is a large fixed egg containing a large supply of nutrients. Male gametes – sperm – – small, most often motile cells that move with the help of one or more flagella. Oogamy is characteristic of animals, higher plants, and many fungi.
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