The medical term for the condition commonly known as a blackhead is

Which osmotic and ionic strategies must marine teleost fishes employ?

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.

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above