Answer:
The scientific study of interactions among organisms and their environment.
Explanation:
It should just be the cell membrane, which regulates what comes into the cell and what leaves it.
Answer:
Hmm.
Explanation:
<em>'Many geologists believe that as the Earth cooled the heavier, denser materials sank to the center and the lighter materials rose to the top. Because of this, the crust is made of the lightest materials (rock- basalts and granites) and the core consists of heavy metals (nickel and iron).'</em>
Answer:
Its reactivity, or tendency to form chemical bonds with other atoms.
Explanation: