Which change in the earth's atmosphere allowed organisms to live on land? A) a collision with a comet
B) the development of the ozone layer
C) a strong burst of particles from the sun
D) the absorption of carbon dioxide by oceans

Nitrofurantoin used during the fifth week of pregnancy places the neonate at risk for which condition?

How does a lytic infection differ from a lysogenic infection?

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.