The umbilical cord select one: a. appears as a tiny stalk and eventually grows to a length of 6 to 12 inches. b. contains one large artery that delivers nutrients to the embryo. c. connects the placenta to the developing organism. d. permits the blood of the mother and the embryo to mix directly.

The umbilical cord select one:

The right option is; b. contains one large artery that delivers nutrients to the embryo.

The umbilical cord is a flexible hollow structure that joins a fetus to the mother’s placenta (an organ that joins to the mother's blood supply). The umbilical cord is composed of; a vein that transports oxygen rich blood and nutrients from the mother to the fetus, and two arteries that transports deoxygenated blood and wastes, such as carbon dioxide, from the fetus back to the placenta.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.