Answer:
any of a large group of vertebrate animals that live in water, breathe with gills, and usually have fins and scales
Explanation:
Answer:
Periodic: electronegativity, ionization energy, electron affinity, atomic radius, melting point, and metallic character
Explanation:
Answer: The role of an organism in the ecosystem is called its NICHE.
Explanation: The niche (pronounced 'neesh') of an organism is the specific function and purpose of the organism within its environment, ecosystem or food-web or food-chain.
<span>It is a nerve agent. Or chemical asphyxiant. An example is Hydrogine Cyanide. </span>
