Which is the first step in the seafloor spreading process? A crack forms in oceanic crust.
Volcanoes erupt under the ocean.
Molten rock rises up through the crust.
Dense plates are subducted under less dense plates.

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.