In humans, a woman becomes pregnant after an ovum and sperm unite (fertilization). after fertilization, a zygote forms. this zygote grows into a fetus after the eighth week of pregnancy. the fetus receives nutrition from the placenta. the umbilical cord connects the fetus and placenta. a sac-like structure, the amniotic sac, envelopes the fetus. the sac contains amniotic fluid, which cushions the fetus and protects it from harm.

What do you generally see in a family when both parents are working?

You isolate an infectious substance capable of causing disease in plants, but you do not know whether the infectious agent is a bacterium, virus, viroid, or prion. you have four methods at your disposal to analyze the substance and determine the nature of the infectious agent. i. treat the substance with enzymes that destroy all nucleic acids and then determine whether the substance is still infectious. ii. microscope. iii. culture the substance on nutritive medium, away from any plant cells. iv. treat the sample with proteases that digest all proteins and then determining whether the substance is still infectious. if you already know that the infectious agent was either bacterial or viral, which method(s) listed above would allow you to distinguish between these two possibilities? a) ib) iic) ii or iiid) iv

Agirl is working really hard in high school and decides to finish some of her classes early , what classes should she choose?