Tortoise shells and snail shells are similar in function to protect the organism from predators based on a comparison of the organisms in the images what can you conclude

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

Look at the photo of the leaf. which term best describes this leaf?