Why do scientists divide Earth's core into and outer core and inner core? Group of answer choices

They exist in different states of matter.

They have a different chemical composition.

They were formed in different geological eras.

They are divided by a layer of partly molten material called the mesosphere.

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

Which set of terms best describes a community of miners who live out in the countryside of west virginia and use specialized geographical equipment to analyze the composition of rocks

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.