The placenta (also known as afterbirth) is an organ that connects the developing fetus to the uterine wall to allow nutrient uptake, provide thermo-regulation to the fetus, waste elimination, and gas exchange via the mother's blood supply, fight against internal infection and produce hormones to support pregnancy.
Weegy: The correct answer is if rocks experience greater heat and pressure, they will turn into metamorphic if they do not melt.
In most cases, we don't see a rock during its formation, so we rely on rocks observable clues to infer their formations. Two clues that indicate a rocks formation are its composition and texture. 1  Composition refers to what a rock is made of.2  The color of a rock can provide a clue to the composition. 3  Fragments of other rocks, fossils, and identifiable mineral grains are also aspects of composition.n most cases, we don't see a rock during its formation, so we rely on rocks observable clues to infer their formations. Two clues that indicate a rocks formation are its composition and texture. 1  Composition refers to what a rock is made of.