Photosynthesis occurs when
a. plants absorb energy from carbon dioxide
b. plants absorb energy from sunlight
c. oxygen concentration in the atmosphere increases
d. all of the above

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.