2. The NASA astronauts from the Apollo missions that landed on the moon experienced 1/6 of the gravitational force that they usually experience on Earth. Provide an explanation for the astronaut's reduced gravitational force.

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?

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

The relationship between intron and exon