If h+ ion is being transported by active transport, draw an arrow on the above picture to show the direction of transport.

the arrow will point upwards because the active transport is the transport against concentration (from low concentration to high concentration) gradient with the help of energy derived from ATP

this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.