Did trilobites and dinosaurs live at the same time? What is your evidence?

An enzyme lowers the energy of activation. what does that mean?

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

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions