Which occurs whenever valence electrons are shared or transferred between atoms? a. a decrease in charge b. radioactive decay c. a chemical reaction d. a increase in charge

Which element is found in both dna and proteins

Which of the following is the source of energy for photosynthesis? a.) glucose b.) chlorophyll c.) carbon dioxide d.) sunlight

What function does the limb sever in each animal? how are the limb bones of the four animals similar? based on these similarities what can be inferred about the evolution of the four animals.