Give two reasons that older adults face a greater risk of vitamin d deficiency than younger people?

As people go older, they would lose some of their ability to sythesize vitamin d. Also, elderly who are home bound are less likely to go outside to exercise so they do not expose the sunlight often, causing them to have lesser vitamin d

The proton has a positive charge while the neutron has no charge they both make up the nucleus of the atom while the elections have a negative charge and surround the nucleus of the atom. the protons and electrons are used to calculate the atom's mass whereas the neutrons don't affect the mass

D.) domain, kingdom, phylum, class, order, family, genus then species