Endosymbiosis refers to the co-existence of living matter where one organism lives within the body or within the cells of another organism.
Answer:
Explanation:
Pollen tubes are produced by the male gametophytes of seed plants. Pollen tubes act as conduits to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms.
Answer:
Are you talking about bacteria type viruses? because that's what I would assume.
Explanation:
Well, all viruses have a core of genetic material like RNA or DNA.
Viruses can have different families, geonomic makeup, host range and transmission mechanism.
I hope this helped in a way.

Actually Welcome to the Concept of the Nomenclature.
The Answer is True.
The International Code of Botanical Nomenclature (ICBN) is the set of rules and recommendations dealing with the formal botanical names that are given to plants.