The brain uses active transport to move across the blood-brain barrier.

What is the mrna strand that would be copied from this dna strand

Florian discovers a rock that is broken into pieces. each piece has several bands. which type of rock does florian predict these pieces will change into when subjected to heat and pressure? igneous magma metamorphic sedimentary

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt