What does luster tell about a mineral?
a. how hard it is
c. if it is metallic
b. how old it is
d. if it contains iron

Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

Which of these has happened to your food by the time it reaches your small intestine? a. all the macromolecules have been broken down completely. b. lipids and starches have been partially broken down. c. starches and proteins have been partially broken down. d. proteins and lipids have been broken down into subunits.

Crossing over is a method of (blank)?