Answer:
Lithium
Explanation:
<em>"Like the other alkali metals, lithium has a single valence electron that is easily given up to form a cation. Because of this, lithium is a good conductor of heat and electricity as well as a highly reactive element, though it is the least reactive of the alkali metals."</em>
An ecosystem is what occurs in the natural community and consists of the physical and chemical factors that made up its abiotic environment. Examples include: a pond, a forest, a grassland, a prairie
B is the correct answer because it allowed he smaller organisms to evolve and not have to hide from dinosaurs
C. A lipid
It's because lipids include glycerol and fatty acids.