What is characteristic of adult frog respiration?

a. Drawing water by inhalation across their gills
b. Countercurrent exchange
c. Sucking air into their lungs using chest muscles
d. Drawing in air by lowering their mouth floor
e. Gills

D. Drawing in air by lowering their mouth floor

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