Crossing over, Independent assortment and Random Fertilization all cause variation. When filling in the boxes of a Punnett Square which one are you actually doing?

Why do we perceive objects as retaining their brightness under different lighting levels?

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.