Between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.
Answer:
c I think because I remember this from a while ago
Rainwater picks up carbon dioxide from the air and as it percolates through the soil, which turns into a weak acid. This slowly dissolves out the limestone along the joints, bedding planes and fractures, some of which become enlarged enough to form caves.
Epithelium is the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures.
Answer:
Because Lumbricina ( Earthworm ) Is a living, breathing, animal
Explanation:
