Which substance is a waste that would normally diffuse across the placenta from the embryo to the mother?

What evidence is there that convection occurs in earth’s troposphere?

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

Heat from earths interior and pressure from overlying rock transform the remains of marine sediments into