Magnetic field . I hope I answered this right .
I think the 4 major types of vectors are plasmids, viral vectors, cosmids, and artificial chromosomes. The most commonly used vectors are plasmids.
Hope this helps! ;0
Answer:Even in a simple flower, a great variety of diverse forms occur in nature. When flowers are arranged linearly on a stem, each flower can have a stem or they can each be stemless. If they are stemless, the flowers are said to be sessile, and the whole structure, or inflorescence, is called a spike. So yes it has a complex stucture
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