Crossing over is the largest contributor to genetic variation in sexually reproducing organisms. true or false

To maintain asepsis when administering an injection, all parts of the syringe can be handled except the:

Parthenogenesis is a type of reproduction that does not require a mate. it’s rarely seen in birds and higher vertebrates. parthenogenesis involves the formation of a zygote. but this zygote is formed without fertilization. in parthenogenesis, in the absence of a male gamete, the ovum develops directly in the zygote.

Using meiosis, the sporophyte produces spores that are .