The placenta is the site where antibodies in the mother's blood pass into the fetal circulation. these antibodies give passive immunity to the fetus for several common childhood diseases. there are some infections for which the mother does not provide antibodies to the fetus. what infection is the fetus not protected from?

Select the correct answer. which formula describes newton’s second law of motion? a. force=mass x accerlaration b. mass/accerlaration c. mass x volacity d. mass/ volacity

After getting the slide and microscope ready, stella is eager to see the microscopic pond water specimen! she crouches around her microscope and aligns her eye with the microscope’s eyepiece. but she's only able to see a bright white light. at this point, no specimens or cells are visible on stella's pond water slide. after taking a moment to collect her thoughts, stella realizes she can't see any lifeforms because .

Compare the composition of the moon's surface with the composition of the earth's surface.