Which of the following statements about parthenogenesis is correct?

• A. Parthenogenesis is only observed in invertebrates.
• B. Parthenogenetic species are typically all male.
• C. In parthenogenesis, courtship is absent because only one sex is involved in reproduction.
• D. In parthenogenesis, males and females each contribute half of the genetic material for the next generation.
• E. Sometimes a parthenogenetically produced egg may double in chromosome number to produce a "zygote."