Which of the following requires an aditional intake of oxygen for a 20 to 30 minute period?
a. aerobic exercise
b. anaerobic exercise
c. flexibilty exercisie
d. high endurance exercise

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.