Answer:
c lower oxygen levels
Explanation:
the higher up the person is the closer to the atmosphere so there is less oxygen
Answer:
✔
Explanation:
genus (pl. genera)
in the modern classification system, a subdivision of a family; includes one or more species of organisms
Answer:
The waves erode seashells and rocks on the shore into small granuels called sand.
Explanation:
Measure the amount of chemical used, measure the mass before and after
