Sudan red can be used to test for lipids. It is soluble in lipids so it will turn the entire sample red. Also, you can do the brown paper test. Put a few drops of the suspected lipid onto a brown...
High frequency sound waves hit objects which absorb or reflect the sound waves and then the waves bounce off the objects that reflect the signal (for example rocks on the ocean floor) and return to a...
If the doctor can see a sex organ on the fetus using ultrasound, then that is a good way to tell. Otherwise, they can take a sample of amniotic fluid that surround the fetus, using a needle, then...