Where does a placental mammals develop before its body systems can function independently "

Asolution at 25 degrees celsius is 1.0 × 10–5 m h3o+. what is the concentration of oh– in this solution?

Which of the following best supports the concept that genetic information is passed on to offspring from both of their parents, not just one?

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?