It rains, water moves and erodes the land and creates valleys and rivers.
<span>which some organisms have learned to harness energy from sources other than the sun, including geothermal energy. That heat energy allows them to form energetic molecules of their own.</span>
B, element
a molecule would require more than one atom. if one atom is left and is still gold, it would not be a molecule/mixture/compound.
"Dissolved oxygen in seawater is used as an indicator of primary production (as its surrogate, so to speak) because the amount of molecular oxygen produced during photosynthesis is directly proportional to the amount of carbon fixed during photosynthesis, and determining the amount of dissolved oxygen is much easier to do."
