An animal without a backbone is known as a(an)

Texas bluebonnet plants seen in this photo are an example of which ecological unit?

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?

Beth’s hygrometer is reading a temperature of 30 c and a relative humidity of 65%. the humidity in the air is?